MFC r226043:

MFC r226043:

Remove assertion against empty NFSv4 ACLs.  An empty ACL is not exactly
valid - we don't allow for setting it on a file, for example - but it's
not something we should assert on.

For STABLE kernel, it changes nothing, because it's not compiled with
INVARIANTS.  If it was, it would fix crashes.  It also fixes an assert
in libc encountered with NFSv4 without nfsuserd(8) running.

git-svn-id: svn://svn.freebsd.org/base/stable/9@235889 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f