ns2: use same name in ctr_group as stat_item_group

Change-Id: I7d2dcb6c7ddf72a0d06ff19f5d0e3dc740bd19ff
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index a57f577..618d55e 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -606,6 +606,7 @@
 
 	bind->nsi->nsvc_rate_ctr_idx++;
 
+	rate_ctr_group_set_name(nsvc->ctrg, id);
 	osmo_stat_item_group_set_name(nsvc->statg, id);
 
 	llist_add(&nsvc->list, &nse->nsvc);