Btrfs: Fix a jump typo of nodatasum_case to avoid wrong WARN_ON()

if (sctx->is_dev_replace && !is_metadata && !have_csum) {
    ...
    goto nodatasum_case;
}
...
nodatasum_case:
    WARN_ON(sctx->is_dev_replace);

In above code, nodatasum_case marker should be moved after
WARN_ON().

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>