s390/cio: export CMG value as decimal

Change format of the "cmg" sysfs attribute from hex to decimal to
make it easier to consume. Note that this should not break any existing
users since only values 2 and 3 are currently exported. Also the main
user already assumes decimal notation [1].

[1] https://sourceforge.net/p/sblim/gather/ci/master/tree/plugin/metriczCH.c

Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

Author: oberpar

drivers/s390/cio/chp.c

@@ -334,7 +334,7 @@ static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr,
 		return 0;
 	if (chp->cmg == -1) /* channel measurements not available */
 		return sprintf(buf, "unknown\n");
-	return sprintf(buf, "%x\n", chp->cmg);
+	return sprintf(buf, "%d\n", chp->cmg);
 }
 
 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);