check for null pointers

This commit was SVN r2425.

src/mca/gpr/replica/gpr_replica.c

@@ -492,6 +492,7 @@ ompi_list_t* gpr_replica_get(ompi_registry_mode_t addr_mode,
 	return answer;
     }
     if (NULL == tokens) { /* wildcard case - return everything */
+    keylist = NULL;
 	keys = NULL;
     } else {
 
@@ -534,7 +535,8 @@ ompi_list_t* gpr_replica_get(ompi_registry_mode_t addr_mode,
 
  CLEANUP:
     /* release list of keys */
-    OBJ_RELEASE(keylist);
+    if(NULL != keylist)
+        OBJ_RELEASE(keylist);
 
     if (NULL != keys) {
 	free(keys);

src/mca/gpr/replica/gpr_replica_internals.c

@@ -575,7 +575,7 @@ ompi_registry_notify_message_t *gpr_replica_construct_notify_message(ompi_regist
     /* compute number of tokens */
     tokptr = tokens;
     num_tokens = 0;
-    while (NULL != *tokptr) {
+    while (tokptr && NULL != *tokptr) {
 	num_tokens++;
 	tokptr++;
     }