s390/virtio-ccw: Fix virtio reset

On virtio reset we must reset the indicator to avoid stale interrupts,
e.g. after a reset.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
(cherry picked from commit 6504a93011)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

hw/s390x/virtio-ccw.c

@@ -803,6 +803,8 @@ static void virtio_ccw_reset(DeviceState *d)
 
     virtio_reset(dev->vdev);
     css_reset_sch(dev->sch);
+    dev->indicators = 0;
+    dev->indicators2 = 0;
 }
 
 /**************** Virtio-ccw Bus Device Descriptions *******************/