module: print db not empty warn to stdout

Do not use logger. Dump tree uses plain stdout so make this the same
(the warning is currently displayed multiple times, for every ancestor
in tree and so the logger issues that the message is repeated n-times
which gets messed with the plain printfs).

Author: MartinPulec

src/module.c

@@ -186,7 +186,7 @@ module_done(struct module *module_data)
         }
         struct module_priv_state *module_priv = module_data->module_priv;
         if (!module_del_ref(module_priv)) {
-                log_msg(LOG_LEVEL_WARNING, "Warning: Child database not empty! Remaining:\n");
+                printf(MOD_NAME "Warning: Child database not empty! Remaining:\n");
                 dump_tree(&module_priv->wrapper, 0);
         }
         module_data->module_priv = NULL; // to avoid multiple deinit