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FILENAME_MAX is the same as PATH_MAX (4kb) in glibc rather than
NAME_MAX's 255. Switch to using NAME_MAX and ensure the '\0' is
accounted for in the path's buffer size.
Fixes: 754baf426e ("perf pmu: Change aliases from list to hashmap")
Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250717150855.1032526-2-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>