hwmon: (s3c-hwmon) Ignore invalid divider settings

Avoid registering channels that have zero divider settings in them, as this
will only lead to kernel OOPS from divide-by-zero when the sysfs entry is
read.
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/s3c-hwmon.c

@@ -323,14 +323,21 @@ static int __devinit s3c_hwmon_probe(struct platform_device *dev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
-		if (!pdata->in[i])
+		struct s3c24xx_adc_hwmon_incfg *cfg = pdata->in[i];
+
+		if (!cfg)
 			continue;
 
-		if (pdata->in[i]->mult >= 0x10000)
+		if (cfg->mult >= 0x10000)
 			dev_warn(&dev->dev,
 				 "channel %d multiplier too large\n",
 				 i);
 
+		if (cfg->divider == 0) {
+			dev_err(&dev->dev, "channel %d divider zero\n", i);
+			continue;
+		}
+
 		ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
 					    &hwmon->attrs[i], i);
 		if (ret) {