Make some variables const to fix compiler warnings

Signed-off-by: Jeff Squyres <jeff@squyres.com>

Author: jsquyres

ompi/mca/coll/inter/coll_inter_allreduce.c

@@ -49,7 +49,8 @@ mca_coll_inter_allreduce_inter(const void *sbuf, void *rbuf, int count,
                                mca_coll_base_module_t *module)
 {
     int err, rank, root = 0;
-    char *tmpbuf = NULL, *pml_buffer = NULL, *source;
+    char *tmpbuf = NULL, *pml_buffer = NULL;
+    const char *source;
     ptrdiff_t gap, span;
 
     rank = ompi_comm_rank(comm);

ompi/mca/osc/rdma/osc_rdma.h

@@ -18,6 +18,7 @@
  * Copyright (c) 2020-2021 Google, LLC. All rights reserved.
  * Copyright (c) 2022      Amazon.com, Inc. or its affiliates.
  *                         All Rights reserved.
+ * Copyright (c) 2023      Jeffrey M. Squyres.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -753,7 +754,7 @@ static inline int osc_rdma_accelerator_mem_move(void *dest, const void *src, siz
  * @retval >0                 The buffer belongs to a managed buffer in
  *                            device memory.
  */
-static inline int osc_rdma_is_accel(void *buf)
+static inline int osc_rdma_is_accel(const void *buf)
 {
     int dev_id;
     uint64_t flags;