nat: Prepare to patch more than the CC Setup message
Refactor the code to allow having different handlers. The goal
is to be able to patch some SMS messages too.
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 8649f43..e0eb635 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -1040,7 +1040,7 @@
* replace the msg and the parsed structure becomes
* invalid.
*/
- msg = bsc_nat_rewrite_setup(bsc->nat, msg, parsed, con->imsi);
+ msg = bsc_nat_rewrite_msg(bsc->nat, msg, parsed, con->imsi);
talloc_free(parsed);
parsed = NULL;
} else if (con->con_local == NAT_CON_END_USSD) {