[PATCH] USB: Fix warning in drivers/usb/media/ov511.c

Gcc 4.0.2 had the warning:

drivers/usb/media/ov511.c: In function 'show_exposure':
drivers/usb/media/ov511.c:5642: warning: 'exp' may be used uninitialized
in this function

Here is the patch to fix that warning.

Signed-off-by: Matthew Martin <lihnucks@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>