virtio-net: fix rsc_ext compat handling

virtio_net_rsc_ext_num_{packets,dupacks} needs to be available
independently of the presence of VIRTIO_NET_HDR_F_RSC_INFO.

Fixes: 2974e916df87 ("virtio-net: support RSC v4/v6 tcp traffic for Windows HCK")
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200427102415.10915-2-cohuck@redhat.com>

hw/net/virtio-net.c

@@ -83,6 +83,8 @@
 #define VIRTIO_NET_HDR_F_RSC_INFO  4 /* rsc_ext data in csum_ fields */
 #define VIRTIO_NET_F_RSC_EXT       61
 
+#endif
+
 static inline __virtio16 *virtio_net_rsc_ext_num_packets(
     struct virtio_net_hdr *hdr)
 {
@@ -95,8 +97,6 @@ static inline __virtio16 *virtio_net_rsc_ext_num_dupacks(
     return &hdr->csum_offset;
 }
 
-#endif
-
 static VirtIOFeature feature_sizes[] = {
     {.flags = 1ULL << VIRTIO_NET_F_MAC,
      .end = endof(struct virtio_net_config, mac)},