9p: Fix possible regressions when ->get_sb fails.
->get_sb can fail causing some badness. this patch fixes
* clear sb->fs_s_info in kill_sb.
* deactivate_locked_super() calls kill_sb (v9fs_kill_super) which closes the
destroys the client, clunks all its fids and closes the v9fs session.
Attempting to do it twice will cause an oops.
Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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