nat: The reject cause of "-1" has failure meaning, change it

bsc_stat_reject is treating -1 as parsing failure but for the
global barring. Change it to another return value so it is
not counted as parsing failure.
1 file changed
tree: c3d9c042c80f85b89d0ced90370450ca96b9c954
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. .gitignore
  7. README