Convert obvious places to deactivate_locked_super()

drivers/mtd/mtdsuper.c

fs/9p/vfs_super.c

fs/afs/super.c

fs/btrfs/super.c

fs/cifs/cifsfs.c

fs/devpts/inode.c

fs/ecryptfs/main.c

fs/libfs.c

fs/nfs/super.c

fs/proc/root.c

fs/ubifs/super.c

kernel/cgroup.c