in unpartition, unlock all child header locks before clearing implicit deps, which take the implicit dep mutex. Fixes lock acquisition order

src/datawizard/filters.c

@@ -492,9 +492,12 @@ void starpu_data_unpartition(starpu_data_handle_t root_handle, unsigned gatherin
 		_starpu_data_free_interfaces(child_handle);
 		_starpu_spin_unlock(&child_handle->header_lock);
 		_starpu_spin_destroy(&child_handle->header_lock);
+	}
 
+	for (child = 0; child < root_handle->nchildren; child++)
+	{
+		starpu_data_handle_t child_handle = starpu_data_get_child(root_handle, child);
 		_starpu_data_clear_implicit(child_handle);
-
 		STARPU_PTHREAD_MUTEX_DESTROY(&child_handle->busy_mutex);
 		STARPU_PTHREAD_COND_DESTROY(&child_handle->busy_cond);
 		STARPU_PTHREAD_MUTEX_DESTROY(&child_handle->sequential_consistency_mutex);