fixes CID 2256.

This commit was SVN r25486.

opal/mca/shmem/mmap/shmem_mmap_module.c

@@ -211,7 +211,7 @@ path_usable(const char *path, int *stat_errno)
 static char *
 get_uniq_file_name(const char *base_path, const char *hash_key)
 {
-    char uniq_name_buf[OPAL_PATH_MAX];
+    char *uniq_name_buf = NULL;
     unsigned long str_hash = 0;
     pid_t my_pid;
     int rand_num;
@@ -220,6 +220,10 @@ get_uniq_file_name(const char *base_path, const char *hash_key)
     if (NULL == hash_key) {
         return NULL;
     }
+    if (NULL == (uniq_name_buf = calloc(OPAL_PATH_MAX, sizeof(char)))) {
+        /* out of resources */
+        return NULL;
+    }
 
     my_pid = getpid();
     srand((unsigned int)(time(NULL) + my_pid));
@@ -229,7 +233,7 @@ get_uniq_file_name(const char *base_path, const char *hash_key)
     snprintf(uniq_name_buf, OPAL_PATH_MAX, "%s/open_mpi_shmem_mmap.%d_%lu_%d",
              base_path, (int)my_pid, str_hash, rand_num);
 
-    return strdup(uniq_name_buf);
+    return uniq_name_buf;
 }
 
 /* ////////////////////////////////////////////////////////////////////////// */