BACKPORT: bpf: enforce return code for cgroup-bpf programs

with addition of tnum logic the verifier got smart enough and
we can enforce return codes at program load time.
For now do so for cgroup-bpf program types.

Change-Id: Iae3a46c3d38810e47cbf4ec23356abae03ded736
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Cyber Knight <cyberknight755@gmail.com>