selftests/bpf: Test for checking return code for the extended prog
This adds test to enforce same check for the return code for the extended prog as it is enforced for the target program. It asserts failure for a return code, which is permitted without the patch in this series, while it is restricted after the application of this patch. Signed-off-by: Udip Pant <udippant@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200825232003.2877030-4-udippant@fb.com
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