Silence Coverity warning

orte/mca/rmaps/base/rmaps_base_map_job.c

@@ -441,6 +441,7 @@ void orte_rmaps_base_map_job(int fd, short args, void *cbdata)
                     {
                         hwloc_obj_t bd=NULL;;
 
+                        memset(tmp1, 0, 1024);
                         orte_get_attribute(&proc->attributes, ORTE_PROC_HWLOC_BOUND, (void**)&bd, OPAL_PTR);
                         if (NULL == bd) {
                             (void)strncpy(tmp1, "UNBOUND", strlen("UNBOUND"));