Bryan Venteicher bae486f5d7 Force two byte alignment for all control message headers
The header structure consists of two 1-byte elements, but it must always
be describable by a single SG entry. Note for consistency, specify the
alignment everywhere, even if the structure has the appropriate natural
alignment since it contains a uint16_t.

Obtained from:	DragonFlyBSD
MFC after:	1 week
2014-06-16 04:32:27 +00:00
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