mfd: intel_soc_pmic_core: Fix unchecked return value

unction devm_regmap_init_i2c() returns an ERR_PTR on errors, and its
return value should be checked before it is dereferenced. However, in
function intel_soc_pmic_i2c_probe(), the return value of function
devm_regmap_init_i2c() is used without validation. This patch fixes it.
Signed-off-by: NPan Bian <bianpan2016@163.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/intel_soc_pmic_core.c

@@ -66,6 +66,9 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
 	dev_set_drvdata(dev, pmic);
 
 	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
+	if (IS_ERR(pmic->regmap))
+		return PTR_ERR(pmic->regmap);
+
 	pmic->irq = i2c->irq;
 
 	ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,