Merge pull request open-mpi#1048 from jsquyres/pr/2.0.0/minor-warnings-fixes

v2.0.0: trivial warnings fixes

Author: hppritcha

ompi/info/info.c

@@ -275,7 +275,7 @@ int ompi_info_set (ompi_info_t *info, const char *key, const char *value)
 int ompi_info_set_value_enum (ompi_info_t *info, const char *key, int value,
                               mca_base_var_enum_t *var_enum)
 {
-    char *string_value;
+    const char *string_value;
     int ret;
 
     ret = var_enum->string_from_value (var_enum, value, &string_value);

orte/mca/rmaps/rank_file/rmaps_rank_file.c

@@ -216,7 +216,7 @@ static int orte_rmaps_rf_map(orte_job_t *jdata)
                         /* all would be oversubscribed, so take the least loaded one */
                         k = UINT32_MAX;
                         OPAL_LIST_FOREACH(nd, &node_list, orte_node_t) {
-                            if (nd->num_procs < k) {
+                            if (nd->num_procs < (orte_vpid_t)k) {
                                 k = nd->num_procs;
                                 node = nd;
                             }