video: fbdev: pxa3xx-gcu: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/pxa3xx-gcu.c

@@ -606,10 +606,8 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
 
 	/* enable the clock */
 	priv->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(priv->clk)) {
-		dev_err(dev, "failed to get clock\n");
-		return PTR_ERR(priv->clk);
-	}
+	if (IS_ERR(priv->clk))
+		return dev_err_probe(dev, PTR_ERR(priv->clk), "failed to get clock\n");
 
 	/* request the IRQ */
 	irq = platform_get_irq(pdev, 0);