bpf: Fix tcp_bufs_kern.c sample program
The program was returning -1 in some cases which is not allowed by the verifier any longer. Fixes: 390ee7e2 ("bpf: enforce return code for cgroup-bpf programs") Signed-off-by: NLawrence Brakmo <brakmo@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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