Add missing btf__free in trace__exit.
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Link: https://lore.kernel.org/r/20250319050741.269828-14-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>