demux: adaptative: avoid drops when not restarting on seek

modules/demux/adaptative/Streams.cpp

@@ -392,15 +392,17 @@ void BaseStreamOutput::setPosition(mtime_t nztime)
     {
         (*it)->drop();
     }
+
+    if(reinitsOnSeek())
+    {
         /* disable appending until restarted */
         b_drop = true;
         vlc_mutex_unlock(&lock);
-
-    if(reinitsOnSeek())
         restart();
-
         vlc_mutex_lock(&lock);
         b_drop = false;
+    }
+
     pcr = VLC_TS_INVALID;
     vlc_mutex_unlock(&lock);