andre 000bdd697d RFC 2292 requires to check msg_controllen, in case that the kernel returns
an empty list for some reasons.

Obtained from:

 NetBSD: socket.h,v 1.62 2001/09/07 08:13:01 itojun
 OpenBSD: socket.h,v 1.39 2001/09/07 16:45:25 itojun

MFC after:	2 weeks
2004-08-11 10:18:49 +00:00
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