test_bpf: Fix NULL vs IS_ERR() check in test_skb_segment()
The skb_segment() function returns error pointers on error. It never returns NULL. Fixes: 76db8087 ("net: bpf: add a test for skb_segment in test_bpf module") Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Acked-by: NDaniel Borkmann <daniel@iogearbox.net> Reviewed-by: NYonghong Song <yhs@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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