drm/etnaviv: Remove useless error message

Fix the following coccicheck report:

drivers/gpu/drm/etnaviv/etnaviv_gpu.c:1775:2-9:
line 1775 is redundant because platform_get_irq() already prints an error

Remove dev_err() messages after platform_get_irq() failures.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1783,10 +1783,8 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
 
 	/* Get Interrupt: */
 	gpu->irq = platform_get_irq(pdev, 0);
-	if (gpu->irq < 0) {
-		dev_err(dev, "failed to get irq: %d\n", gpu->irq);
+	if (gpu->irq < 0)
 		return gpu->irq;
-	}
 
 	err = devm_request_irq(&pdev->dev, gpu->irq, irq_handler, 0,
 			       dev_name(gpu->dev), gpu);