USB: mos7840: remove unnecessary null test before kfree

Cc: Johan Hovold <jhovold@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/mos7840.c

@@ -1181,10 +1181,7 @@ static void mos7840_close(struct usb_serial_port *port)
 	/* Freeing Write URBs */
 	for (j = 0; j < NUM_URBS; ++j) {
 		if (mos7840_port->write_urb_pool[j]) {
-			if (mos7840_port->write_urb_pool[j]->transfer_buffer)
-				kfree(mos7840_port->write_urb_pool[j]->
-				      transfer_buffer);
-
+			kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
 			usb_free_urb(mos7840_port->write_urb_pool[j]);
 		}
 	}