Fix dragging OOB send buffer in case of idle connection

Signed-off-by: Timo J. Rinne <tri@iki.fi>

Author: rinne

src/network/transportsender-impl.h

@@ -193,7 +193,7 @@ void TransportSender<MyState>::tick( void )
   }
 
   if ( diff.empty() ) {
-    if ( (now >= next_ack_time) ) {
+    if ( (now >= next_ack_time) || ((now >= next_send_time) && oob()->has_output()) ) {
       send_empty_ack();
       mindelay_clock = uint64_t( -1 );
     }
@@ -205,8 +205,6 @@ void TransportSender<MyState>::tick( void )
     /* Send diffs or ack */
     send_to_receiver( diff );
     mindelay_clock = uint64_t( -1 );
-  } else if ( oob()->has_output() && ((now >= next_send_time) || (now >= next_ack_time)) ) {
-    send_empty_ack();
   }
 }