lib/filterx: fix LogMessage variables lookup

These type of variables should only be returned if
they are in sync with the scope (log_msg_has_changes flag is FALSE).

Signed-off-by: Szilard Parrag <szilard.parrag@axoflow.com>

lib/filterx/filterx-scope.c

@@ -182,6 +182,8 @@ filterx_scope_validate_variable(FilterXScope *self, FilterXVariable *variable)
   if (filterx_variable_handle_is_floating(variable->handle) &&
       !variable->declared && variable->generation != self->generation)
     return FALSE;
+  if(!filterx_variable_handle_is_floating(variable->handle) && filterx_scope_has_log_msg_changes(self))
+    return FALSE;
   return TRUE;
 }