[media] lirc_igorplugusb: Fix a compilation waring

drivers/staging/lirc/lirc_igorplugusb.c: In function ‘usb_remote_probe’:
drivers/staging/lirc/lirc_igorplugusb.c:393: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘unsigned int’
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/lirc/lirc_igorplugusb.c

@@ -390,7 +390,7 @@ static int usb_remote_probe(struct usb_interface *intf,
 	devnum = dev->devnum;
 	maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 
-	dprintk(DRIVER_NAME "[%d]: bytes_in_key=%lu maxp=%d\n",
+	dprintk(DRIVER_NAME "[%d]: bytes_in_key=%zu maxp=%d\n",
 		devnum, CODE_LENGTH, maxp);