nat: Fix potential memory leak when reading a message

Spotted while going through the code with Jacob. We could have
leaked the msgb in case of error.
1 file changed
tree: 00c6c4b2451a9a6087bdbf76ba730866d8b8e6d0
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README