btrfs: constify input buffer of btrfs_csum_data
The function does not modify the input buffer, also update a typecast in
one caller.
Signed-off-by: 
David Sterba <dsterba@suse.com>
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The function does not modify the input buffer, also update a typecast in
one caller.
Signed-off-by: David Sterba <dsterba@suse.com>