use osmo_init_logging2() with proper talloc ctx

Change-Id: I3e2a9aef5242efdf11a64536f79099a6e9cec53f
diff --git a/tests/legacy_mgcp/mgcp_transcoding_test.c b/tests/legacy_mgcp/mgcp_transcoding_test.c
index 61de25f..d3f94c7 100644
--- a/tests/legacy_mgcp/mgcp_transcoding_test.c
+++ b/tests/legacy_mgcp/mgcp_transcoding_test.c
@@ -588,7 +588,8 @@
 int main(int argc, char **argv)
 {
 	int rc;
-	osmo_init_logging(&log_info);
+	void *ctx = talloc_named_const(NULL, 0, "mgcp_transcoding_test");
+	osmo_init_logging2(ctx, &log_info);
 
 	printf("=== Transcoding Good Cases ===\n");