gsup_server: Add "priv" pointer and make it point to 'struct hlr'

Change-Id: Iada68996b7f4cbdcca92b254ddaf6b88b962e6f1
diff --git a/src/hlr.c b/src/hlr.c
index 940165f..643dfff 100644
--- a/src/hlr.c
+++ b/src/hlr.c
@@ -600,7 +600,7 @@
 	}
 
 	g_hlr->gs = osmo_gsup_server_create(hlr_ctx, g_hlr->gsup_bind_addr, OSMO_GSUP_PORT,
-					    read_cb, &g_lu_ops);
+					    read_cb, &g_lu_ops, g_hlr);
 	if (!g_hlr->gs) {
 		LOGP(DMAIN, LOGL_FATAL, "Error starting GSUP server\n");
 		exit(1);