Lock the cells for the extra_hydro tasks

src/task.c

@@ -427,6 +427,7 @@ void task_unlock(struct task *t) {
     case task_type_drift_part:
     case task_type_sort:
     case task_type_ghost:
+    case task_type_extra_ghost:
     case task_type_end_hydro_force:
     case task_type_timestep_limiter:
       cell_unlocktree(ci);
@@ -572,6 +573,7 @@ int task_lock(struct task *t) {
     case task_type_drift_part:
     case task_type_sort:
     case task_type_ghost:
+    case task_type_extra_ghost:
     case task_type_end_hydro_force:
     case task_type_timestep_limiter:
       if (ci->hydro.hold) return 0;