[PATCH 2/7] vhost-user: tighten "reply_supported" scope in "set_vring_addr"

[Laszlo Ersek]

In the vhost_user_set_vring_addr() function, we calculate
"reply_supported" unconditionally, even though we'll only need it if
"wait_for_reply" is also true.

Restrict the scope of "reply_supported" to the minimum.

This is purely refactoring -- no observable change.

Cc: "Michael S. Tsirkin" <m...@redhat.com> (supporter:vhost)
Cc: Eugenio Perez Martin <epere...@redhat.com>
Cc: German Maglione <gmagli...@redhat.com>
Cc: Liu Jiang <ge...@linux.alibaba.com>
Cc: Sergio Lopez Pascual <s...@redhat.com>
Cc: Stefano Garzarella <sgarz...@redhat.com>
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
 hw/virtio/vhost-user.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index b4b677c1ce66..64eac317bfb2 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -1331,17 +1331,18 @@ static int vhost_user_set_vring_addr(struct vhost_dev 
*dev,
         .hdr.size = sizeof(msg.payload.addr),
     };
 
-    bool reply_supported = virtio_has_feature(dev->protocol_features,
-                                              VHOST_USER_PROTOCOL_F_REPLY_ACK);
-
     /*
      * wait for a reply if logging is enabled to make sure
      * backend is actually logging changes
      */
     bool wait_for_reply = addr->flags & (1 << VHOST_VRING_F_LOG);
 
-    if (reply_supported && wait_for_reply) {
-        msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
+    if (wait_for_reply) {
+        bool reply_supported = virtio_has_feature(dev->protocol_features,
+                                          VHOST_USER_PROTOCOL_F_REPLY_ACK);
+        if (reply_supported) {
+            msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
+        }
     }
 
     ret = vhost_user_write(dev, &msg, NULL, 0);