USB: "sparse" cleanups for usb gadgets

This removes complaints about the gadget stack which are generated by
the currrent "sparse":  it doesn't like the fact that zero is the null
pointer.  (Last I checked, C guarantees that's correct ...)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

6 files changed, 11 insertions, 8 deletions

diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
index d18901b92cda..c6760aee1e5c 100644
--- a/drivers/usb/gadget/config.c
+++ b/drivers/usb/gadget/config.c
@@ -50,7 +50,7 @@ usb_descriptor_fillbuf(void *buf, unsigned buflen,
                 return -EINVAL;
 
         /* fill buffer from src[] until null descriptor ptr */
-        for (; 0 != *src; src++) {
+        for (; NULL != *src; src++) {
                 unsigned                len = (*src)->bLength;
 
                 if (len > buflen)
diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 6042364402b8..3aa46cfa66ba 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -71,7 +71,7 @@ ep_matches (
         u16             max;
 
         /* endpoint already claimed? */
-        if (0 != ep->driver_data)
+        if (NULL != ep->driver_data)
                 return 0;
 
         /* only support ep0 for portable CONTROL traffic */
diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index a3376739a81b..593e23507b1a 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -1723,7 +1723,8 @@ rx_submit (struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
                 size += sizeof (struct rndis_packet_msg_type);
         size -= size % dev->out_ep->maxpacket;
 
-        if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
+        skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags);
+        if (skb == NULL) {
                 DEBUG (dev, "no rx skb\n");
                 goto enomem;
         }
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index e60745ffaf8e..173004f60fea 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -964,7 +964,7 @@ static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len)
         }
         if (len > sizeof (dev->rbuf))
                 req->buf = kmalloc(len, GFP_ATOMIC);
-        if (req->buf == 0) {
+        if (req->buf == NULL) {
                 req->buf = dev->rbuf;
                 return -ENOMEM;
         }
@@ -1394,7 +1394,7 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
         dev->setup_abort = 0;
         if (dev->state == STATE_DEV_UNCONNECTED) {
 #ifdef  CONFIG_USB_GADGET_DUALSPEED
-                if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) {
+                if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == NULL) {
                         spin_unlock(&dev->lock);
                         ERROR (dev, "no high speed config??\n");
                         return -EINVAL;
diff --git a/drivers/usb/gadget/m66592-udc.c b/drivers/usb/gadget/m66592-udc.c
index 700dda8a9157..4b27d12f049d 100644
--- a/drivers/usb/gadget/m66592-udc.c
+++ b/drivers/usb/gadget/m66592-udc.c
@@ -1299,7 +1299,7 @@ static int m66592_queue(struct usb_ep *_ep, struct usb_request *_req,
         req->req.actual = 0;
         req->req.status = -EINPROGRESS;
 
-        if (ep->desc == 0)      /* control */
+        if (ep->desc == NULL)   /* control */
                 start_ep0(ep, req);
         else {
                 if (request && !ep->busy)
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index a2e6e3fc8c8d..fcfe869acb94 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -653,7 +653,8 @@ set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
                         result = usb_ep_enable (ep, d);
                         if (result == 0) {
                                 ep->driver_data = dev;
-                                if (source_sink_start_ep (ep, gfp_flags) != 0) {
+                                if (source_sink_start_ep(ep, gfp_flags)
+                                                != NULL) {
                                         dev->in_ep = ep;
                                         continue;
                                 }
@@ -667,7 +668,8 @@ set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
                         result = usb_ep_enable (ep, d);
                         if (result == 0) {
                                 ep->driver_data = dev;
-                                if (source_sink_start_ep (ep, gfp_flags) != 0) {
+                                if (source_sink_start_ep(ep, gfp_flags)
+                                                != NULL) {
                                         dev->out_ep = ep;
                                         continue;
                                 }