A vfio-ccw bugfix: avoid freeing that which should not be freed.

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Merge tag 'vfio-ccw-20171109' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw into features

Pull vfio-ccw update from Cornelia Huck:
"A vfio-ccw bugfix: avoid freeing that which should not be freed."

drivers/s390/cio/vfio_ccw_cp.c

@@ -332,6 +332,8 @@ static void ccwchain_cda_free(struct ccwchain *chain, int idx)
 {
 	struct ccw1 *ccw = chain->ch_ccw + idx;
 
+	if (ccw_is_test(ccw) || ccw_is_noop(ccw) || ccw_is_tic(ccw))
+		return;
 	if (!ccw->count)
 		return;