qed/qed_dev: guard against a possible division by zero
Previously we would divide total_left_rate by zero if num_vports happened to be 1 because non_requested_count is calculated as num_vports - req_count. Guard against this by validating num_vports at the beginning and returning an error otherwise. Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool. Fixes: bcd197c8 ("qed: Add vport WFQ configuration APIs") Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru> Reviewed-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/20230309201556.191392-1-d-tatianin@yandex-team.ruSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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