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fsverity_operations::write_merkle_tree_block is passed the index of the
block to write and the log base 2 of the block size.  However, all
implementations of it use these parameters only to calculate the
position and the size of the block, in bytes.

Therefore, make ->write_merkle_tree_block take 'pos' and 'size'
parameters instead of 'index' and 'log_blocksize'.
Suggested-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20221214224304.145712-5-ebiggers@kernel.org