nat: Check for the access list in set command as well

I omitted the check as this was already done by the verify
function for this command. Please Coverity and do the check
again even if it is not necessary. I begin to doubt the
usage of a "dedicated" verify method as well.

Silences: Coverity CID 1293150
1 file changed
tree: 5f2d265141ba46b749ea920a08ad9006333298da
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. .gitignore
  7. README