[RFC PATCH v2 02/10] vdpa: make batch_begin_once early return

["Eugenio Pérez" <eperezma@redhat.com>]

Prefer early return so it is easier to merge
vhost_vdpa_listener_begin_batch here and make iotlb baches begin and end
symmetrical.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-vdpa.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index cc252fc2d8..bf9771870a 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -160,11 +160,12 @@ static void vhost_vdpa_listener_begin_batch(VhostVDPAShared *s)
 
 static void vhost_vdpa_iotlb_batch_begin_once(VhostVDPAShared *s)
 {
-    if (s->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH) &&
-        !s->iotlb_batch_begin_sent) {
-        vhost_vdpa_listener_begin_batch(s);
+    if (!(s->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH)) ||
+        s->iotlb_batch_begin_sent) {
+        return;
     }
 
+    vhost_vdpa_listener_begin_batch(s);
     s->iotlb_batch_begin_sent = true;
 }
 
-- 
2.39.3