drm/sun4i: Remove redundant dev_err call in sun4i_tcon_init_regmap()

There is a error message within devm_ioremap_resource
already, so remove the dev_err call to avoid redundant
error message.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 2145ecf..9180e7e 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -374,10 +374,8 @@
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(dev, res);
-	if (IS_ERR(regs)) {
-		dev_err(dev, "Couldn't map the TCON registers\n");
+	if (IS_ERR(regs))
 		return PTR_ERR(regs);
-	}
 
 	tcon->regs = devm_regmap_init_mmio(dev, regs,
 					   &sun4i_tcon_regmap_config);