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[ Upstream commitf45ba67eb7] platform_get_irq() return negative value on failure, so null check of return value is incorrect. Fix it by comparing whether it is less than zero. Fixes:9055a2f591("ixp4xx_eth: make ptp support a platform driver") Reported-by: Zeal Robot <zealci@zte.com.cn> Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20220412085126.2532924-1-lv.ruyi@zte.com.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>