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drm/mcde: Fix handling of platform_get_irq() error
[ Upstream commit e2dae67 ] platform_get_irq() returns -ERRNO on error. In such case comparison to 0 would pass the check. Fixes: 5fc537b ("drm/mcde: Add new driver for ST-Ericsson MCDE") Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200827071107.27429-1-krzk@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>
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