Al Viro 3df629d873 gfs2_meta: ->mount() can get NULL dev_name
get in sync with mount_bdev() handling of the same

Reported-by: syzbot+c54f8e94e6bba03b04e9@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-10-13 00:19:13 -04:00
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