bpf: fix return in bpf_skb_adjust_net
The bpf_skb_adjust_net() ignores the return value of bpf_skb_net_shrink/grow, and always return 0, fix it by return 'ret'. Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com> Acked-by: NDaniel Borkmann <daniel@iogearbox.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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