Do not active the sub-hydro tasks whhen finding a sub-pair star-density.

src/engine_maketasks.c

@@ -936,8 +936,8 @@ void engine_make_hierarchical_tasks_hydro(struct engine *e, struct cell *c) {
       engine_add_ghosts(e, c, c->hydro.ghost_in, c->hydro.ghost_out);
 
       if (with_feedback) {
-	c->stars.ghost = scheduler_addtask(s, task_type_stars_ghost,
-					   task_subtype_none, 0, 0, c, NULL);
+        c->stars.ghost = scheduler_addtask(s, task_type_stars_ghost,
+                                           task_subtype_none, 0, 0, c, NULL);
       }
 
 #ifdef EXTRA_HYDRO_LOOP

src/engine_marktasks.c

@@ -376,7 +376,6 @@ void engine_marktasks_mapper(void *map_data, int num_elements,
         else if (t_type == task_type_sub_pair &&
                  t_subtype == task_subtype_stars_density) {
           cell_activate_subcell_stars_tasks(t->ci, t->cj, s);
-          cell_activate_subcell_hydro_tasks(t->ci, t->cj, s);
         }
       }