pcsx2:gui: fix potential infinite loop

pcsx2/gui/ConsoleLogger.cpp

@@ -948,7 +948,10 @@ void ConsoleLogFrame::DoFlushEvent( bool isPending )
 		} while( --m_WaitingThreadsForFlush > 0 );
 
 		int count = m_sem_QueueFlushed.Count();
-		while( count < 0 ) m_sem_QueueFlushed.Post();
+		while( count < 0 ) {
+			m_sem_QueueFlushed.Post();
+			count = m_sem_QueueFlushed.Count();
+		}
 	}
 
 	m_pendingFlushMsg = isPending;