[PATCH spice-server v2] red-channel-client: Simplify red_channel_client_wait_pipe_item_sent loop

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Avoid repeating the same code twice.
red_channel_client_send send the item pending (or the a part of it). If
there are no item pending the function does nothing (so checking for
blocked channel is useless). Also red_channel_client_send is already
called from red_channel_client_push checking for channel blocked before.
The function on its overall tries to wait for a given item to be sent.
The call for red_channel_client_receive is mainly needed to support the
cases were to send data messages from the client should be processed
(like if "handle-acks" is requested).
Put the check for the loop inside it to avoid this duplication.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/red-channel-client.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

Changes since v1:
- removed red_channel_client_send call;
- extend commit message.

diff --git a/server/red-channel-client.c b/server/red-channel-client.c
index de3ac27cb..792ad167b 100644
--- a/server/red-channel-client.c
+++ b/server/red-channel-client.c
@@ -1781,18 +1781,14 @@ bool red_channel_client_wait_pipe_item_sent(RedChannelClient *rcc,
     red_pipe_item_ref(&mark_item->base);
     red_channel_client_pipe_add_after_pos(rcc, &mark_item->base, item_pos);
 
-    if (red_channel_client_is_blocked(rcc)) {
-        red_channel_client_receive(rcc);
-        red_channel_client_send(rcc);
-    }
-    red_channel_client_push(rcc);
-
-    while (mark_item->item_in_pipe &&
-           (timeout == -1 || spice_get_monotonic_time_ns() < end_time)) {
-        usleep(CHANNEL_BLOCKED_SLEEP_DURATION);
+    for (;;) {
         red_channel_client_receive(rcc);
-        red_channel_client_send(rcc);
         red_channel_client_push(rcc);
+        if (!mark_item->item_in_pipe ||
+            (timeout != -1 && spice_get_monotonic_time_ns() >= end_time)) {
+            break;
+        }
+        usleep(CHANNEL_BLOCKED_SLEEP_DURATION);
     }
 
     item_in_pipe = mark_item->item_in_pipe;
-- 
2.13.5

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