nrpe doesn't handle non-normal exit

[Klas Lindfors]

Hello,

After the waitpid() in nrpe WEXITSTATUS() is called without first
checking WIFEXITED() which leads to checks being reported ok if the
child for instance died on a signal. Attached patch adds a check to
WIFEXITED() before the WEXITSTATUS() check.

-- 
Klas Lindfors
Stockholm University
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