V4L/DVB (4990): Cpia2/cpia2_usb.c: fix error-path leak

Free previously allocated memory (in array elements) if kmalloc() returns
NULL in submit_urbs().
Signed-off-by: Amit Choudhary <amit2030@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cpia2/cpia2_usb.c

@@ -640,6 +640,10 @@ static int submit_urbs(struct camera_data *cam)
 		cam->sbuf[i].data =
 		    kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
 		if (!cam->sbuf[i].data) {
+			while (--i >= 0) {
+				kfree(cam->sbuf[i].data);
+				cam->sbuf[i].data = NULL;
+			}
 			return -ENOMEM;
 		}
 	}