hw/net/virtio-net:Remove redundant statement in virtio_net_rsc_tcp_ctrl_check()

Clang static code analyzer show warning:
hw/net/virtio-net.c:2077:5: warning: Value stored to 'tcp_flag' is never read
    tcp_flag &= VIRTIO_NET_TCP_FLAG;
    ^           ~~~~~~~~~~~~~~~~~~~

The 'VIRTIO_NET_TCP_FLAG' is '0x3F'. The last ‘tcp_flag’ assignment statement is
 the same as that of the first two statements.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20200827110311.164316-7-kuhn.chenqun@huawei.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a1fe9e928533751ca33c119aab0c6434694f5165..cb0d27084c1000bdd8b02ebdf174d83158ac7fb7 100644 (file)
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2075,7 +2075,6 @@ static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
     tcp_flag = htons(tcp->th_offset_flags);
     tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
     tcp_flag &= VIRTIO_NET_TCP_FLAG;
-    tcp_flag = htons(tcp->th_offset_flags) & 0x3F;
     if (tcp_flag & TH_SYN) {
         chain->stat.tcp_syn++;
         return RSC_BYPASS;