rtc: pcf2123: Add missing error code assignment before test

It is likely that checking the result of 'pcf2123_write_reg' is expected
here.
Also fix a small style issue. The '{' at the beginning of the function
is misplaced.

Fixes: 809b453b76 ("rtc: pcf2123: clean up writes to the rtc chip")

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-pcf2123.c

@@ -182,7 +182,8 @@ static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
 }
 
 static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
-			     const char *buffer, size_t count) {
+			     const char *buffer, size_t count)
+{
 	struct pcf2123_sysfs_reg *r;
 	unsigned long reg;
 	unsigned long val;
@@ -199,7 +200,7 @@ static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		return ret;
 
-	pcf2123_write_reg(dev, reg, val);
+	ret = pcf2123_write_reg(dev, reg, val);
 	if (ret < 0)
 		return -EIO;
 	return count;