dhclient - Delete trailing NUL's when parsing NVT ASCII options.

dhclient - Delete trailing NUL's when parsing NVT ASCII options.

- RFC 2132 says "Options containing NVT ASCII data SHOULD NOT include
  a trailing NULL; however, the receiver of such options MUST be
  prepared to delete trailing nulls if they exist."
- Should fix odd results when 'append'ing info to such options via
  dhclient.conf.

Taken-from: OpenBSD