Btrfs: cleanup the similar code of the fs root read
There are several functions whose code is similar, such as btrfs_find_last_root() btrfs_read_fs_root_no_radix() Besides that, some functions are invoked twice, it is unnecessary, for example, we are sure that all roots which is found in btrfs_find_orphan_roots() have their orphan items, so it is unnecessary to check the orphan item again. So cleanup it. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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