V4L/DVB (8887): gspca: fix memory leak

Free allocated memory

Cc: Jean-Francois Moine <[e-mail]>
Cc: Hans de Goede <[e-mail]>
Signed-off-by: Douglas Schilling Landgraf <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/gspca/gspca.c

···
 		urb = usb_alloc_urb(npkt, GFP_KERNEL);
 		if (!urb) {
 			err("usb_alloc_urb failed");
+			for (i = 0; i < n; i++)
+				usb_free_urb(gspca_dev->urb[i]);
 			return -ENOMEM;
 		}
 		urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,