[media] lirc_imon: use complete() instead complete_all()

There is only one waiter for the completion, therefore there
is no need to use complete_all(). Let's make that clear by
using complete() instead of complete_all().

While we are at it, we do a small optimization with the
reinitialization of the completion before we use it.

The usage pattern of the completion is:

waiter context                          waker context

send_packet()
  reinit_completion()
  usb_sumbit_urb()
  wait_for_completion_interruptible()

                                        usb_tx_callback()
                                          complete()

                                        imon_disconnect()
                                          complete()

Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/lirc/lirc_imon.c

@@ -334,7 +334,7 @@ static int send_packet(struct imon_context *context)
 
 	context->tx_urb->actual_length = 0;
 
-	init_completion(&context->tx.finished);
+	reinit_completion(&context->tx.finished);
 	atomic_set(&context->tx.busy, 1);
 
 	retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
@@ -497,6 +497,8 @@ static int ir_open(void *data)
 	context->rx.initial_space = 1;
 	context->rx.prev_bit = 0;
 
+	init_completion(&context->tx.finished);
+
 	context->ir_isopen = 1;
 	dev_info(context->driver->dev, "IR port opened\n");
 
@@ -930,7 +932,7 @@ static void imon_disconnect(struct usb_interface *interface)
 	/* Abort ongoing write */
 	if (atomic_read(&context->tx.busy)) {
 		usb_kill_urb(context->tx_urb);
-		complete_all(&context->tx.finished);
+		complete(&context->tx.finished);
 	}
 
 	context->dev_present = 0;