nat: Possible crash fix, only filter non local connections

For local connections con_msc is not set and sending a RLSD
to the network would have ended up in a segfault.
1 file changed
tree: 95d81521b797131cd82ec41cc1d432aedc43252a
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/