btrfs: use btrfs_crc32c{,_final}() in for free space cache
The CRC checksum in the free space cache is not dependant on the super block's csum_type field but always a CRC32C. So use btrfs_crc32c() and btrfs_crc32c_final() instead of btrfs_csum_data() and btrfs_csum_final() for computing these checksums. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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