K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2019-01-08T09:04:27.271428Z
K 7
svn:log
V 270
Avoid overfow in vtruncbuf()

Using daddr_t instead of int avoids trunclbn to become negative when it
shouldn't.
This isssue was found by running syzkaller.

Reviewed by:		mckusick, kib, markj
MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D18763

END