osmo-hlr: Add talloc context introspection via VTY

This requires libosmocore with Change-Id
I43fc42880b22294d83c565ae600ac65e4f38b30d or later.

Change-Id: Ibc2c333b83f85fa69a364e3e342f12f50dbc2f70
diff --git a/src/hlr.c b/src/hlr.c
index 168e203..f3a6864 100644
--- a/src/hlr.c
+++ b/src/hlr.c
@@ -439,6 +439,7 @@
 
 	hlr_ctx = talloc_named_const(NULL, 1, "OsmoHLR");
 	msgb_talloc_ctx_init(hlr_ctx, 0);
+	vty_info.tall_ctx = hlr_ctx;
 
 	g_hlr = talloc_zero(hlr_ctx, struct hlr);