Btrfs: Break loop when reach BTRFS_MAX_MIRRORS in scrub_setup_recheck_block()

Use break instead of useless loop should be more suitable in this
case.

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>