mfd: lp873x: Remove unused mutex lock from struct lp873x

The mutex is not used, so remove it.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/lp873x.c

@@ -53,8 +53,6 @@ static int lp873x_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	mutex_init(&lp873->lock);
-
 	ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid);
 	if (ret) {
 		dev_err(lp873->dev, "Failed to read OTP ID\n");

include/linux/mfd/lp873x.h

@@ -263,7 +263,6 @@ enum lp873x_regulator_id {
 struct lp873x {
 	struct device *dev;
 	u8 rev;
-	struct mutex lock;	/* lock guarding the data structure */
 	struct regmap *regmap;
 };
 #endif /* __LINUX_MFD_LP873X_H */