fbdev: goldfishfb: Do not check 0 for platform_get_irq()

Since platform_get_irq() never returned zero, so it need not to check
whether it returned zero, and we use the return error code of
platform_get_irq() to replace the current return error code.

Please refer to the commit a85a6c86 ("driver core: platform: Clarify
that IRQ 0 is invalid") to get that platform_get_irq() never returned
zero.
Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/goldfishfb.c

@@ -203,8 +203,8 @@ static int goldfish_fb_probe(struct platform_device *pdev)
 	}
 
 	fb->irq = platform_get_irq(pdev, 0);
-	if (fb->irq <= 0) {
-		ret = -ENODEV;
+	if (fb->irq < 0) {
+		ret = fb->irq;
 		goto err_no_irq;
 	}