tests/hnb-test: Initialize logging with existing struct log_info

Change-Id: Ic92e60dda41a9e4d139294b1e851fff5c4f26143
diff --git a/src/tests/hnb-test.c b/src/tests/hnb-test.c
index 7824858..e6fa7ba 100644
--- a/src/tests/hnb-test.c
+++ b/src/tests/hnb-test.c
@@ -941,6 +941,8 @@
 
 	tall_hnb_ctx = talloc_named_const(NULL, 0, "hnb_context");
 
+	osmo_init_logging2(tall_hnb_ctx, &hnb_test_log_info);
+
 	vty_init(&vty_info);
 	hnbtest_vty_init();