s390-ccw.img: Fix compile warning in s390 ccw virtio code

Lets fix this gcc warning:

virtio.c: In function ‘vring_send_buf’:
virtio.c:125:35: error: operation on ‘vr->next_idx’ may be undefined
[-Werror=sequence-point]

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 79e2941618f6c27d53cda52542612d5925e795db..1968fc6619ef6769f49949e831ee9a5256326c5c 100644 (file)
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -122,7 +122,9 @@ static void vring_send_buf(struct vring *vr, void *p, int len, int flags)
     vr->desc[vr->next_idx].addr = (ulong)p;
     vr->desc[vr->next_idx].len = len;
     vr->desc[vr->next_idx].flags = flags & ~VRING_HIDDEN_IS_CHAIN;
-    vr->desc[vr->next_idx].next = ++vr->next_idx;
+    vr->desc[vr->next_idx].next = vr->next_idx;
+    vr->desc[vr->next_idx].next++;
+    vr->next_idx++;
 
     /* Chains only have a single ID */
     if (!(flags & VRING_DESC_F_NEXT)) {