libmsc: Set the "trans->conn" to NULL to catch invalid usage

Make finding use-after-free more easy and set it to NULL.
1 file changed
tree: 8f6edf097a66db7cf4c819b7e13dca252e450829
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README