btrfs: use inode from io_ctl in io_ctl_prepare_pages
io_ctl_prepare_pages() gets a 'struct btrfs_io_ctl' as well as a 'struct inode', but btrfs_io_ctl::inode points to the same struct inode as this is assgined in io_ctl_init(). Use the inode form io_ctl to reduce the arguments of io_ctl_prepare_pages. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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