1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index 4bbbbe688077..9df1d3f66c87 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -1088,11 +1088,11 @@ static int c4_read_proc(char *page, char **start, off_t off,
         default: s = "???"; break;
         }
         len += sprintf(page+len, "%-16s %s\n", "type", s);
-        if ((s = cinfo->version[VER_DRIVER]) != 0)
+        if ((s = cinfo->version[VER_DRIVER]) != NULL)
            len += sprintf(page+len, "%-16s %s\n", "ver_driver", s);
-        if ((s = cinfo->version[VER_CARDTYPE]) != 0)
+        if ((s = cinfo->version[VER_CARDTYPE]) != NULL)
            len += sprintf(page+len, "%-16s %s\n", "ver_cardtype", s);
-        if ((s = cinfo->version[VER_SERIAL]) != 0)
+        if ((s = cinfo->version[VER_SERIAL]) != NULL)
            len += sprintf(page+len, "%-16s %s\n", "ver_serial", s);
 
         if (card->cardtype != avm_m1) {
@@ -1167,7 +1167,7 @@ static int c4_add_card(struct capicardparams *p, struct pci_dev *dev,
         }
 
         card->mbase = ioremap(card->membase, 128);
-        if (card->mbase == 0) {
+        if (card->mbase == NULL) {
                 printk(KERN_NOTICE "c4: can't remap memory at 0x%lx\n",
                        card->membase);
                 retval = -EIO;
@@ -1291,9 +1291,9 @@ static int __init c4_init(void)
         char rev[32];
         int err;
 
-        if ((p = strchr(revision, ':')) != 0 && p[1]) {
+        if ((p = strchr(revision, ':')) != NULL && p[1]) {
                 strlcpy(rev, p + 2, 32);
-                if ((p = strchr(rev, '$')) != 0 && p > rev)
+                if ((p = strchr(rev, '$')) != NULL && p > rev)
                    *(p-1) = 0;
         } else
                 strcpy(rev, "1.0");