Enji Cooper 8b8a0b8883 Initialize ai to NULL and test for ai with type-appropriate values
Depending on the address family and ai_flags containing AI_V4MAPPED,
it might not do a proper DNS lookup on the provided DNS address

Convert some `ai` boolean true/false checks to NULL/non-NULL while here.

MFC after:	1 week
PR:		211790
Reported by:	Herbie.Robinson@stratus.com
Sponsored by:	EMC / Isilon Storage Division
2016-08-13 02:05:06 +00:00
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