coll/acoll: plug a memory leak

Have mca_coll_acoll_comm_query() not leak when invoked on
an inter-communicator nor a single process communicator.

Refs. #13070

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

Author: ggouaillardet

ompi/mca/coll/acoll/coll_acoll_module.c

@@ -60,11 +60,6 @@ mca_coll_base_module_t *mca_coll_acoll_comm_query(struct ompi_communicator_t *co
 {
     mca_coll_acoll_module_t *acoll_module;
 
-    acoll_module = OBJ_NEW(mca_coll_acoll_module_t);
-    if (NULL == acoll_module) {
-        return NULL;
-    }
-
     if (OMPI_COMM_IS_INTER(comm)) {
         *priority = 0;
         return NULL;
@@ -74,6 +69,11 @@ mca_coll_base_module_t *mca_coll_acoll_comm_query(struct ompi_communicator_t *co
         return NULL;
     }
 
+    acoll_module = OBJ_NEW(mca_coll_acoll_module_t);
+    if (NULL == acoll_module) {
+        return NULL;
+    }
+
     *priority = mca_coll_acoll_priority;
 
     /* Set topology params */