comm/cid: keep Intel OneAPI compiler happy

PR #12465 gave Intel OneAPI a headache and threw an error trying
to compile the code.  This patch fixes that.

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

Author: hppritcha

ompi/communicator/comm_cid.c

@@ -24,7 +24,7 @@
  * Copyright (c) 2017      Mellanox Technologies. All rights reserved.
  * Copyright (c) 2018      Amazon.com, Inc. or its affiliates.  All Rights reserved.
  * Copyright (c) 2021      Nanook Consulting.  All rights reserved.
- * Copyright (c) 2020-2022 Triad National Security, LLC. All rights
+ * Copyright (c) 2020-2024 Triad National Security, LLC. All rights
  *                         reserved.
  * $COPYRIGHT$
  *
@@ -590,7 +590,7 @@ static int ompi_comm_allreduce_getnextcid (ompi_comm_request_t *request)
         context->nextlocal_cid = mca_pml.pml_max_contextid;
         for (unsigned int i = context->start ; i < mca_pml.pml_max_contextid ; ++i) {
             flag = opal_pointer_array_test_and_set_item (&ompi_mpi_communicators, i,
-                                                         OMPI_COMM_SENTINEL);
+                                                         (void *)OMPI_COMM_SENTINEL);
             if (true == flag) {
                 context->nextlocal_cid = i;
                 break;
@@ -664,7 +664,8 @@ static int ompi_comm_checkcid (ompi_comm_request_t *request)
             opal_pointer_array_set_item(&ompi_mpi_communicators, context->nextlocal_cid, NULL);
 
             context->flag = opal_pointer_array_test_and_set_item (&ompi_mpi_communicators,
-                                                                  context->nextcid, OMPI_COMM_SENTINEL);
+                                                                  context->nextcid, 
+                                                                  (void *)OMPI_COMM_SENTINEL);
         }
     }
 
@@ -716,7 +717,7 @@ static int ompi_comm_nextcid_check_flag (ompi_comm_request_t *request)
             for (unsigned int i = context->start ; i < mca_pml.pml_max_contextid ; ++i) {
                 bool flag;
                 flag = opal_pointer_array_test_and_set_item (&ompi_mpi_communicators, i,
-                                                             OMPI_COMM_SENTINEL);
+                                                             (void *)OMPI_COMM_SENTINEL);
                 if (true == flag) {
                     context->nextlocal_cid = i;
                     break;