s390/cio: fix memleak in channel measurement

The measurement block for the extended measurement data is not freed when
switching off per device measurement. Free the measurement block after HW
stopped accessing it.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/cmf.c

@@ -876,8 +876,10 @@ static void free_cmbe(struct ccw_device *cdev)
 	spin_lock_irq(cdev->ccwlock);
 	cmb_data = cdev->private->cmb;
 	cdev->private->cmb = NULL;
-	if (cmb_data)
+	if (cmb_data) {
 		kfree(cmb_data->last_block);
+		kfree(cmb_data->hw_block);
+	}
 	kfree(cmb_data);
 
 	/* deactivate global measurement if this is the last channel */