btrfs: factor __btrfs_open_devices() to create btrfs_open_one_device()
No functional changes, create btrfs_open_one_device() from __btrfs_open_devices(). This is a preparatory work to add dynamic device scan. Signed-off-by: NAnand Jain <anand.jain@oracle.com> [ minor whitespace fixes ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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