replay: fix processing async events

Asynchronous events saved at checkpoints may invoke
callbacks when processed. These callbacks may also generate/read
new events (e.g. clock reads). Therefore event processing flag must be
reset before callback invocation.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20180227095203.1060.70831.stgit@pasha-VirtualBox>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

replay/replay-events.c

@@ -295,13 +295,13 @@ void replay_read_events(int checkpoint)
         if (!event) {
             break;
         }
+        replay_finish_event();
+        read_event_kind = -1;
         replay_mutex_unlock();
         replay_run_event(event);
         replay_mutex_lock();
 
         g_free(event);
-        replay_finish_event();
-        read_event_kind = -1;
     }
 }