USB: serial: garmin_gps: fix memory leak on failed URB submit

Make sure to free the URB transfer buffer in case submission fails (e.g.
due to a disconnect).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>

drivers/usb/serial/garmin_gps.c

···
 		   "%s - usb_submit_urb(write bulk) failed with status = %d\n",
 				__func__, status);
 		count = status;
+		kfree(buffer);
 	}
 
 	/* we are done with this urb, so let the host driver