bfq: Check kstrtoul() return value
Make sysfs writes fail for invalid numbers instead of storing uninitialized data copied from the stack. This patch removes all uninitialized_var() occurrences from the BFQ source code. Acked-by: NPaolo Valente <paolo.valente@linaro.org> Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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