bpf: fix bpf_setsockopts return value

This patch fixes a bug causing any sock operations to always return EINVAL.

Fixes: a5192c52 ("bpf: fix to bpf_setsockops").
Reported-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NYuchung Cheng <ycheng@google.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Acked-by: NCraig Gallek <kraig@google.com>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NLawrence Brakmo <brakmo@fb.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/filter.c

@@ -2872,7 +2872,6 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
 				ret = -EINVAL;
 			}
 		}
-		ret = -EINVAL;
 #endif
 	} else {
 		ret = -EINVAL;