serial: tegra: Don't print error on probe deferral

If the Tegra serial driver is probe before clocks are available then the
following error is seen on boot:

 serial-tegra 3100000.serial: Couldn't get the clock

This has been observed on Jetson AGX Orin. Fix this by calling
dev_err_probe() instead of dev_err() to avoid printing an error on probe
deferral.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230703113759.75608-1-jonathanh@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/serial-tegra.c

@@ -1589,10 +1589,8 @@ static int tegra_uart_probe(struct platform_device *pdev)
 		return PTR_ERR(u->membase);
 
 	tup->uart_clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(tup->uart_clk)) {
-		dev_err(&pdev->dev, "Couldn't get the clock\n");
-		return PTR_ERR(tup->uart_clk);
-	}
+	if (IS_ERR(tup->uart_clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(tup->uart_clk), "Couldn't get the clock");
 
 	tup->rst = devm_reset_control_get_exclusive(&pdev->dev, "serial");
 	if (IS_ERR(tup->rst)) {