ext4: ext4_mark_recovery_complete() doesn't need to use lock_super

The function ext4_mark_recovery_complete() is called from two call
paths: either (a) while mounting the filesystem, in which case there's
no danger of any other CPU calling write_super() until the mount is
completed, and (b) while remounting the filesystem read-write, in
which case the fs core has already locked the superblock.  This also
allows us to take out a very vile unlock_super()/lock_super() pair in
ext4_remount().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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