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block, bfq: handle NULL return value by bfq_init_rq()
As reported in [1], the call bfq_init_rq(rq) may return NULL in case of OOM (in particular, if rq->elv.icq is NULL because memory allocation failed in failed in ioc_create_icq()). This commit handles this circumstance. [1] https://lkml.org/lkml/2019/7/22/824 Cc: Hsin-Yi Wang <[email protected]> Cc: Nicolas Boichat <[email protected]> Cc: Doug Anderson <[email protected]> Reported-by: Guenter Roeck <[email protected]> Reported-by: Hsin-Yi Wang <[email protected]> Reviewed-by: Guenter Roeck <[email protected]> Signed-off-by: Paolo Valente <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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