check_dns: fix error detection on sles nslookup

on sles (ex. 11sp1) systems the nslookup output for not found was not parsed correctly
and interpreted as ok when it should be critical:

./check_dns -H nosuchhost.nodomain -t 1 -vvv
/usr/bin/nslookup -sil nosuchhost.nodomain Server:         10.0.2.3
Address:        10.0.2.3#53
Non-authoritative answer:
*** Can't find nosuchhost.nodomain: No answer
DNS OK: 0.011 seconds response time. nosuchhost.nodomain returns |time=0.010892s;;;0.000000

Signed-off-by: Sven Nierlein <sven@nierlein.de>

0 files changed, 0 insertions, 0 deletions