Arguments to NL callbacks should have static storage.

If not the argument can be overwritten by stack usage.

Signed-off-by: José Miguel Gonçalves <jose.goncalves@inov.pt>
Added missing newlines.

Signed-off-by: José Miguel Gonçalves <jose.goncalves@inov.pt>
Removed warning: unused variable 'sep'.

Signed-off-by: José Miguel Gonçalves <jose.goncalves@inov.pt>