btrfs: cleanup btrfs_find_device_by_devspec()
btrfs_find_device_by_devspec() finds the device by @devid or by @device_path. This patch makes code flow easy to read by open coding the else part and renames devpath to device_path. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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