Merge branch 'libbpf: allow to opt-out from BPF map creation'

Andrii Nakryiko says:

====================

Add bpf_map__set_autocreate() API which is a BPF map counterpart of
bpf_program__set_autoload() and serves similar goal of allowing to build more
flexible CO-RE applications. See patch #3 for example scenarios in which the
need for such API came up previously.

Patch #1 is a follow-up patch to previous patch set adding verifier log fixup
logic, making sure bpf_core_format_spec()'s return result is used for
something useful.

Patch #2 is a small refactoring to avoid unnecessary verbose memory management
around obj->maps array.

Patch #3 adds and API and corresponding BPF verifier log fix up logic to
provide human-comprehensible error message with useful details.

Patch #4 adds a simple selftest validating both the API itself and libbpf's
log fixup logic for it.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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