Mark Johnston eca9ac5a32 vfs: Avoid a comparison with an uninitialized field in setutimes()
Some filesystems, e.g., devfs, do not populate va_birthtime in their
GETATTR implementations.  To handle this, make sure that va_birthtime is
initialized to the quasi-standard value of { VNOVAL, 0 } before calling
VOP_GETATTR.

Reported by:	KMSAN
Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31468
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