decoder: remove bogus buffering signal

Allocating a picture does not mean much w.r.t. buffering. The decoder
may just have started.

src/input/decoder.c

@@ -434,15 +434,6 @@ static picture_t *vout_new_buffer( decoder_t *p_dec )
         if( p_picture )
             return p_picture;
 
-        /* */
-        vlc_mutex_lock( &p_owner->lock );
-        if( p_owner->b_waiting )
-        {
-            p_owner->b_has_data = true;
-            vlc_cond_signal( &p_owner->wait_acknowledge );
-        }
-        vlc_mutex_unlock( &p_owner->lock );
-
         /* FIXME add a vout_WaitPictureAvailable (timedwait) */
         msleep( VOUT_OUTMEM_SLEEP );
     }