mgcp: Return 0 in case transcoding is disabled.

In case transcoding is disabled no error has happened, return
a zero. This is fixing starting the nat without transcoding.
1 file changed
tree: 234258704ee64e87017e5b4aee23a7a75d757367
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/