null_blk: cleanup zoned mode initialization
To avoid potential compilation problems, replaced the badly written MB_TO_SECTS() macro (missing parenthesis around the argument use) with the inline function mb_to_sects(). And while at it, simplify the calculation of the total number of zones of the device using the round_up() macro. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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