Use new stat item/ctr getter APIs

Generated with spatch:
"""
@@
expression E1, E2;
@@
- &E2->ctr[E1]
+ rate_ctr_group_get_ctr(E2, E1)
"""

"""
@@
expression E1, E2, E3;
@@
- E2->items[E1]
+ osmo_stat_item_group_get_item(E2, E1)
"""

Change-Id: I41297a8df68e28dfc6016330ac82b0ed5dd0ebc1
diff --git a/tests/gb/gprs_ns_test.c b/tests/gb/gprs_ns_test.c
index 454a29e..6ced6a3 100644
--- a/tests/gb/gprs_ns_test.c
+++ b/tests/gb/gprs_ns_test.c
@@ -262,7 +262,7 @@
 	unsigned int i;
 
 	for (i = 0; i < ctrg->desc->num_ctr; i++) {
-		struct rate_ctr *ctr = &ctrg->ctr[i];
+		struct rate_ctr *ctr = rate_ctr_group_get_ctr(ctrg, i);
 		if (ctr->current && !strchr(ctrg->desc->ctr_desc[i].name, ':'))
 			fprintf(stream, " %s%s: %llu%s",
 				prefix, ctrg->desc->ctr_desc[i].description,