UMTS AKA resync: fix argument ordering

According to libosmocore change-id I0dcbd49759fc32d3b8974102dbd1d6703364ebf4
this argument ordering will not result in successful AUTS. Pass in order
auts, auts_rand so that these are passed correctly to our milenage code.

Change-Id: I6aa19004ec27bad5e9c2bf688d9bbc55d697ccb0
diff --git a/src/auc.c b/src/auc.c
index bec3ea6..3f3db34 100644
--- a/src/auc.c
+++ b/src/auc.c
@@ -71,8 +71,8 @@
 				       i, num_vec);
 			if (rand_auts && auts)
 				rc = osmo_auth_gen_vec_auts(vec+i, aud3g,
-							    rand_auts,
-							    auts, rand);
+							    auts, rand_auts,
+							    rand);
 			else
 				rc = osmo_auth_gen_vec(vec+i, aud3g, rand);
 			if (rc < 0) {