mncc: Fix a crash in the call release code

When the remote subscriber has not responded yet we could
end up with a crash in the MNCC code. It was enough to dial
the number, then hang up and bsc_hack would end up with a
segfault due the list poisining of linux_list.
1 file changed
tree: 71dbee59d32ba29a7b3b5f6564c12243db9bd439
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/