ext4: drop lock_super()/unlock_super()
We don't need lock_super()/unlock_super() any more, since the places
where it is used, we are protected by the s_umount r/w semaphore.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: Marco Stornelli <marco.stornelli@gmail.com>
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