Correctly set _PWF_FILES in pw_fields when appropriate. (_PWF_NIS and _PWF_HESIOD were already being set.)
Correctly set _PWF_FILES in pw_fields when appropriate.
(_PWF_NIS and _PWF_HESIOD were already being set.)

Reported by:	Shizuka Kudo <shizukakudo_99@yahoo.com>
Sponsored by:	DARPA, Network Associates Laboratories

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