rtc: tps65910: Remove redundant dev_warn() and do not check for 0 return after calling platform_get_irq()

It is not possible for platform_get_irq() to return 0. Use the
return value from platform_get_irq().

And there is no need to call the dev_warn() function directly to print
a custom message when handling an error from platform_get_irq()
function as it is going to display an appropriate error message
in case of a failure.

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230803080713.4061782-3-ruanjinjie@huawei.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: ruanjinjie-eng

drivers/rtc/rtc-tps65910.c

@@ -406,11 +406,8 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, tps_rtc);
 
 	irq  = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
-		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
-			irq);
-		return -ENXIO;
-	}
+	if (irq < 0)
+		return irq;
 
 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 		tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,