In vfs_write_suspend_umnt(), if suspension cannot be established, do
not forget to restore write ops count when returning the error.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274501 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f