- Changed default return type for rmw_get_publishers_info_by_topic and

rmw_get_subscriptions_info_by_topic to RMW_RET_UNSUPPORTED.
- Added a rmw_reset_error_msg() after GET_SYMBOL() to above two
functions to prevent a display of "Error message being replaced. Called
rcultils_reset_error() after error handling".

Signed-off-by: Jaison Titus <jaisontj92@gmail.com>

rmw_implementation/src/functions.cpp

@@ -535,7 +535,7 @@ RMW_INTERFACE_FN(rmw_set_log_severity,
   1, ARG_TYPES(rmw_log_severity_t))
 
 RMW_INTERFACE_FN(rmw_get_publishers_info_by_topic,
-  rmw_ret_t, RMW_RET_ERROR,
+  rmw_ret_t, RMW_RET_UNSUPPORTED,
   5, ARG_TYPES(
     const rmw_node_t *,
     rcutils_allocator_t *,
@@ -544,7 +544,7 @@ RMW_INTERFACE_FN(rmw_get_publishers_info_by_topic,
     rmw_topic_info_array_t *))
 
 RMW_INTERFACE_FN(rmw_get_subscriptions_info_by_topic,
-  rmw_ret_t, RMW_RET_ERROR,
+  rmw_ret_t, RMW_RET_UNSUPPORTED,
   5, ARG_TYPES(
     const rmw_node_t *,
     rcutils_allocator_t *,
@@ -626,7 +626,9 @@ void prefetch_symbols(void)
   GET_SYMBOL(rmw_service_server_is_available)
   GET_SYMBOL(rmw_set_log_severity)
   GET_SYMBOL(rmw_get_publishers_info_by_topic)
+  rmw_reset_error();
   GET_SYMBOL(rmw_get_subscriptions_info_by_topic)
+  rmw_reset_error();
 }
 
 void * symbol_rmw_init = nullptr;