[PATCH] USB: negative index in drivers/usb/host/isp116x-hcd.c

From: Eric Sesterhenn <snakebyte@gmx.de>

This fixes coverity Bug #390.

With the following code

	ret = ep->branch = balance(isp116x, ep->period, ep->load);
	if (ret < 0)
		goto fail;

the problem is that ret and balance are of the type int, and ep->branch is u16.
so the int balance() returns gets reduced to u16 and then converted to an int again,
which removes the sign. Maybe the following little c program can explain it better:

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index e99210b7909b..c5e224048efa 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/drivers/usb/host/isp116x-hcd.c
@@ -781,7 +781,7 @@ static int isp116x_urb_enqueue(struct usb_hcd *hcd,
                 if (ep->branch < PERIODIC_SIZE)
                         break;
 
-                ret = ep->branch = balance(isp116x, ep->period, ep->load);
+                ep->branch = ret = balance(isp116x, ep->period, ep->load);
                 if (ret < 0)
                         goto fail;
                 ret = 0;