Use rmw_namespace_validation_result_string() in rmw_create_node (#765)

Signed-off-by: Christophe Bedard <[email protected]>

Author: christophebedard-apexai

rmw_fastrtps_shared_cpp/src/rmw_node.cpp

@@ -64,7 +64,7 @@ __rmw_create_node(
     return nullptr;
   }
   if (RMW_NAMESPACE_VALID != validation_result) {
-    const char * reason = rmw_node_name_validation_result_string(validation_result);
+    const char * reason = rmw_namespace_validation_result_string(validation_result);
     RMW_SET_ERROR_MSG_WITH_FORMAT_STRING("invalid node namespace: %s", reason);
     return nullptr;
   }