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Fix the checkpatch.pl warning: "Prefer kstrto<type> to single variable sscanf".
Signed-off-by: Salah Triki <salah.triki@gmail.com>
Link: https://lore.kernel.org/r/20210710165432.GA690401@pc

Signed-off-by: Vinod Koul <vkoul@kernel.org>