MFC: r276192, r276200

MFC: r276192, r276200
Modify vop_stdadvlock{async}() so that it only
locks/unlocks the vnode and does a VOP_GETATTR()
for the SEEK_END case. This is safe to do, since
lf_advlock{async}() only uses the size argument
for the SEEK_END case.
The NFSv4 server needs this when
vfs.nfsd.enable_locallocks!=0 since locking the
vnode results in a LOR that can cause a deadlock
for the nfsd threads.

git-svn-id: svn://svn.freebsd.org/base/stable/9@276440 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f