Revert "decoder: flush the vout at exit"

This reverts commit 09bb0203.

src/input/decoder.c

@@ -1761,14 +1761,6 @@ void input_DecoderDelete( decoder_t *p_dec )
     vlc_mutex_lock( &p_owner->lock );
     p_owner->b_waiting = false;
     vlc_cond_signal( &p_owner->wait_request );
-
-    /* If the video output is paused or too slow, the decoded picture FIFO may
-     * contain so many picture buffers that the decoder gets stuck waiting for
-     * free buffers. Force all pending pictures in the decoder output FIFO
-     * released to enable decoder forward progress - up to the thread
-     * cancellation. */
-    if( p_owner->p_vout != NULL )
-        vout_Flush( p_owner->p_vout, VLC_TS_INVALID + 1 );
     vlc_mutex_unlock( &p_owner->lock );
 
     vlc_join( p_owner->thread, NULL );