USB: ir-usb: fix incorrect write-buffer length

Returned length should include header length.

Signed-off-by: Johan Hovold <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/serial/ir-usb.c

···
 						void *dest, size_t size)
 {
 	unsigned char *buf = dest;
+	int count;
 
 	/*
 	 * The first byte of the packet we send to the device contains an
···
 	 */
 	*buf = ir_xbof | ir_baud;
 
-	return kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
+	count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
 								&port->lock);
+	return count + 1;
 }
 
 static void ir_process_read_urb(struct urb *urb)