USB: g_printer, fix empty if statement

A bug every C programmer makes at some point in time...

Signed-off-by: Adrian Bunk <[e-mail]>
Signed-off-by: Craig W. Nadler <[e-mail]>
Signed-off-by: David Brownell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/gadget/printer.c

···
 		printer_req_free(dev->in_ep, req);
 	}
 
-	if (dev->current_rx_req != NULL);
+	if (dev->current_rx_req != NULL)
 		printer_req_free(dev->out_ep, dev->current_rx_req);
 
 	while (!list_empty(&dev->rx_reqs)) {