Mark Johnston 03ad7e450a Fix an infinite loop in setnetgrent(3) with NIS netgroups.
Handle an empty result from yp_match() by returning NULL, which is
consistent with the handling of an empty netgroup in /etc/netgroup.
setnetgrent(3) has no return value, so there is no particular need to
distinguish this case from an error.

PR:		26486
MFC after:	2 weeks
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