nilfs2: make superblock data array index computation sparse friendly

Upon running sparse, "warning: dubious: x & !y" is output at an array
index calculation within nilfs_load_super_block().

The calculation is not wrong, but to eliminate the sparse warning, replace
it with an equivalent calculation.

Also, add a comment to make it easier to understand what the unintuitive
array index calculation is doing and whether it's correct.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: e339ad31f599 ("nilfs2: introduce secondary super block")
Signed-off-by: Ryusuke Konishi <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: kernel test robot <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions