V4L/DVB: zoran: cleanup pointer condition

Remove the following sparse warning (see "make C=1"):
 * warning: Using plain integer as NULL pointer
Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/zoran/zoran_driver.c

@@ -324,7 +324,7 @@ static int jpg_fbuffer_alloc(struct zoran_fh *fh)
 		/* Allocate fragment table for this buffer */
 
 		mem = (void *)get_zeroed_page(GFP_KERNEL);
-		if (mem == 0) {
+		if (!mem) {
 			dprintk(1,
 				KERN_ERR
 				"%s: %s - get_zeroed_page (frag_tab) failed for buffer %d\n",