drm/fsl-dcu: use PTR_ERR_OR_ZERO() to simplify the code

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR.

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_tcon.c b/drivers/gpu/drm/fsl-dcu/fsl_tcon.c
index bca09ea..3194e54 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_tcon.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_tcon.c
@@ -57,10 +57,7 @@
 
 	tcon->regs = devm_regmap_init_mmio(dev, regs,
 					   &fsl_tcon_regmap_config);
-	if (IS_ERR(tcon->regs))
-		return PTR_ERR(tcon->regs);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(tcon->regs);
 }
 
 struct fsl_tcon *fsl_tcon_init(struct device *dev)