Comment 0 for bug 1906866

Please revert [focal] d946d4ddd6af bpf: Zero-fill re-used per-cpu map element

Reported upstream:
 https://<email address hidden>/T/#u

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This v5.4.78 commit breaks the tools/testing/selftests/bpf build:

[linux-5.4.y] c602ad2b52dc bpf: Zero-fill re-used per-cpu map element
[focal] d946d4ddd6af bpf: Zero-fill re-used per-cpu map element

Like this:

        prog_tests/map_init.c:5:10: fatal error: test_map_init.skel.h: No such file or directory
            5 | #include "test_map_init.skel.h"

Because tools/testing/selftests/bpf/Makefile in v5.4 does not have the
"skeleton header generation" stuff (circa v5.6).