osmo-hnbgw: set a proper talloc ctx for logging

Change-Id: I006103d8d7fb15e2612fff619879940d8405e045
diff --git a/src/hnbgw.c b/src/hnbgw.c
index 31498cd..fa655ae 100644
--- a/src/hnbgw.c
+++ b/src/hnbgw.c
@@ -527,7 +527,7 @@
 	g_hnb_gw = hnb_gw_create(tall_hnb_ctx);
 	g_hnb_gw->config.rnc_id = 23;
 
-	rc = osmo_init_logging(&hnbgw_log_info);
+	rc = osmo_init_logging2(tall_hnb_ctx, &hnbgw_log_info);
 	if (rc < 0)
 		exit(1);