selftests/bpf: Fix error return code in run_getsockopt_test()
Fix to return a negative error code from the error handling case instead of 0, as done elsewhere in this function. Fixes: 65b4414a ("selftests/bpf: add sockopt test that exercises BPF_F_ALLOW_MULTI") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20201116101633.64627-1-wanghai38@huawei.com
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