drm/tve200: Fix handling of platform_get_irq() error

platform_get_irq() returns -ERRNO on error.  In such case comparison
to 0 would pass the check.

Fixes: 179c02fe ("drm/tve200: Add new driver for TVE200")
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/20200827071107.27429-2-krzk@kernel.org

drivers/gpu/drm/tve200/tve200_drv.c

@@ -200,8 +200,8 @@ static int tve200_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
-		ret = -EINVAL;
+	if (irq < 0) {
+		ret = irq;
 		goto clk_disable;
 	}