We are about to use un/load_bpf_testmod functions in couple tests
and it's better  to print output to stdout,  so it's aligned with
tests ASSERT macros output, which use stdout as well.
Acked-by: David Vernet <void@manifault.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230515133756.1658301-5-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov <ast@kernel.org>