i2c: davinci: remove dead code in probe

From the comment of platform_get_irq, it only returns non-zero IRQ
number and negative error number, other than zero.

Fix this by removing the if condition.
Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-davinci.c

@@ -764,11 +764,8 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 	int r, irq;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
-		if (!irq)
-			irq = -ENXIO;
+	if (irq < 0)
 		return dev_err_probe(&pdev->dev, irq, "can't get irq resource\n");
-	}
 
 	dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev),
 			GFP_KERNEL);