Let the code blend in.

src/control/playlist.c

@@ -230,7 +230,7 @@ libvlc_input_t * libvlc_playlist_get_input( libvlc_instance_t *p_instance,
     if( !p_input )
     {
         libvlc_exception_raise( p_e, "out of memory" );
-        vlc_mutex_unlock( &p_instance->p_playlist->object_lock );
+        vlc_mutex_unlock( &PL->object_lock );
         return NULL;
     }
     p_input->i_input_id = PL->p_input->i_object_id;