mfd: lm3533: Simplify function return logic

The invoked functions already return zero on success or a negative
errno code so there is no need to open code the logic in the caller.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/lm3533-core.c

···
 	if (ret)
 		return ret;
 
-	ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
-	if (ret)
-		return ret;
-
-	return 0;
+	return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
 }
 
 static int lm3533_device_init(struct lm3533 *lm3533)
···
 	lm3533->dev = &i2c->dev;
 	lm3533->irq = i2c->irq;
 
-	ret = lm3533_device_init(lm3533);
-	if (ret)
-		return ret;
-
-	return 0;
+	return lm3533_device_init(lm3533);
 }
 
 static int lm3533_i2c_remove(struct i2c_client *i2c)