net: Rename send_queue to incoming_queue

Each networking client has a queue for packets that could not yet be
delivered to that client. Calling this queue "send_queue" is highly
confusing as it has nothing to to with packets send from this client but
to it. Avoid this confusing by renaming it to "incoming_queue".

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/net/hub.c b/net/hub.c
index df32074..33a99c9 100644
--- a/net/hub.c
+++ b/net/hub.c
@@ -347,7 +347,7 @@
 
     QLIST_FOREACH(port, &source_port->hub->ports, next) {
         if (port != source_port) {
-            ret += qemu_net_queue_flush(port->nc.send_queue);
+            ret += qemu_net_queue_flush(port->nc.incoming_queue);
         }
     }
     return ret ? true : false;