extcon: axp288: Add missed error check

It seems from the very beginning the error check has been missed
in axp288_extcon_log_rsi(). Add it here.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-axp288.c

@@ -135,6 +135,11 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
 	int ret;
 
 	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
+	if (ret < 0) {
+		dev_err(info->dev, "failed to read reset source indicator\n");
+		return;
+	}
+
 	for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
 		if (val & BIT(i)) {
 			dev_dbg(info->dev, "%s\n", *rsi);