usrloc: Fix a bug in MI "ul_dump" output structure

When the code was ported to the new MI interface, the AoR KV-Store ended
up being moved to the wrong place, effectively crashing on 0 contacts.

(cherry picked from commit 6929c4a)

modules/usrloc/ul_mi.c

@@ -222,7 +222,7 @@ static inline int mi_add_aor_node(mi_item_t *aor_item, urecord_t* r,
 
 	if (mi_dump_kv_store) {
 		kv_buf = store_serialize(r->kv_storage);
-		if (!ZSTR(kv_buf) && (add_mi_string(ct_item, MI_SSTR("KV-Store"),
+		if (!ZSTR(kv_buf) && (add_mi_string(aor_item, MI_SSTR("KV-Store"),
 				kv_buf.s, kv_buf.len) < 0)) {
 				store_free_buffer(&kv_buf);
 				return -1;