extcon: Fix the checkpatch warning

This patch fixes the checkpatch warning about coding style.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-max14577.c

@@ -539,8 +539,6 @@ static void max14577_muic_irq_work(struct work_struct *work)
 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
 
 	mutex_unlock(&info->mutex);
-
-	return;
 }
 
 /*
@@ -730,8 +728,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
 				muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
-				"failed: irq request (IRQ: %d,"
-				" error :%d)\n",
+				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
 			return ret;
 		}