i2c: exynos5: don't check for irq 0

platform_get_irq never returns 0. Don't check for this. Make it clear that
the error path always returns a negative error code.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-exynos5.c

@@ -778,7 +778,7 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
 	init_completion(&i2c->msg_complete);
 
 	i2c->irq = ret = platform_get_irq(pdev, 0);
-	if (ret <= 0)
+	if (ret < 0)
 		goto err_clk;
 
 	ret = devm_request_irq(&pdev->dev, i2c->irq, exynos5_i2c_irq,