item-ext.c: detach from all parent nodes (fixed)

src/playlist/item-ext.c

@@ -909,7 +909,7 @@ int playlist_TreeMove( playlist_t * p_playlist, playlist_item_t *p_item,
             p_detach->i_serial++;
             free( p_item->pp_parents[i] );
             REMOVE_ELEM( p_item->pp_parents, p_item->i_parents, i );
-            break;
+            i--;
         }
     }