virtio_net: check virtqueue_add_sgs() return value
As virtqueue_add_sgs() can fail, we should check the return value. Addresses-Coverity-ID: 1464439 ("Unchecked return value") Signed-off-by: Yunjian Wang <wangyunjian@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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