nat: Work around trying to forward a msg to a msc that does not exist

Instead of segfaulting warn the user that the MSC Connection does
not exist...
1 file changed
tree: d2c784dd6ec7349e13aee54b97ad48cfe8b0a8fc
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/