Merge branch 'fix-btf_dedup'

Andrii Nakryiko says:

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This patch set fixes bug in btf_dedup_is_equiv() check mishandling equivalence
comparison between VOID kind in candidate type graph versus anonymous non-VOID
kind in canonical type graph.

Patch #1 fixes bug, by comparing candidate and canonical kinds for equality,
before proceeding to kind-specific checks.
Patch #2 adds a test case testing this specific scenario.
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Signed-off-by: Alexei Starovoitov <ast@kernel.org>