virtio-net: Do not specify VIRTIO_RING_F_INDIRECT_DESC twice.

VIRTIO_RING_F_INDIRECT_DESC belongs to the base features bits. No need
to specify it in net driver.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Reviewed-by: Dor Laor <dor@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

drivers/virtio-net.cc

@@ -703,8 +703,7 @@ u32 net::get_driver_features(void)
                  | (1 << VIRTIO_NET_F_GUEST_TSO4) \
                  | (1 << VIRTIO_NET_F_HOST_ECN)   \
                  | (1 << VIRTIO_NET_F_HOST_TSO4)  \
-                 | (1 << VIRTIO_NET_F_GUEST_ECN)  \
-                 | (1 << VIRTIO_RING_F_INDIRECT_DESC));
+                 | (1 << VIRTIO_NET_F_GUEST_ECN));
 }
 
 hw_driver* net::probe(hw_device* dev)