net: ipa: Remove useless error message

Fix the following coccicheck report:

drivers/net/ipa/gsi.c:1341:2-9:
line 1341 is redundant because platform_get_irq() already prints an error

Remove dev_err() messages after platform_get_irq_byname() failures.
Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/gsi.c

@@ -1337,10 +1337,9 @@ static int gsi_irq_init(struct gsi *gsi, struct platform_device *pdev)
 	int ret;
 
 	ret = platform_get_irq_byname(pdev, "gsi");
-	if (ret <= 0) {
-		dev_err(dev, "DT error %d getting \"gsi\" IRQ property\n", ret);
+	if (ret <= 0)
 		return ret ? : -EINVAL;
-	}
+
 	irq = ret;
 
 	ret = request_irq(irq, gsi_isr, 0, "gsi", gsi);