btrfs: reduce scope of btrfs_scratch_superblocks()
btrfs_scratch_superblocks() isn't used anywhere outside volumes.c so remove it from the header file and mark it as static. Also move it above it's callers so we don't need a forward declaration. Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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