perf test: Fix leak in "Synthesize attr update" test

JIRA: https://issues.redhat.com/browse/RHEL-78197

upstream
========
commit 2c744f3
Author: Ian Rogers <irogers@google.com>
Date: Wed Mar 5 11:19:31 2025 -0800

description
===========
The own_cpus map variable may be non-NULL and hold a reference, in
particular on hybrid machines. Do a put before overwriting the
variable to avoid a memory leak.

    Signed-off-by: Ian Rogers <irogers@google.com>
    Reviewed-by: James Clark <james.clark@linaro.org>
    Link: https://lore.kernel.org/r/20250305191931.604764-1-irogers@google.com
    Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Signed-off-by: Michael Petlan <mpetlan@redhat.com>

Author: rfmvh

tools/perf/tests/event_update.c

@@ -109,6 +109,7 @@ static int test__event_update(struct test_suite *test __maybe_unused, int subtes
 	TEST_ASSERT_VAL("failed to synthesize attr update name",
 			!perf_event__synthesize_event_update_name(&tmp.tool, evsel, process_event_name));
 
+	perf_cpu_map__put(evsel->core.own_cpus);
 	evsel->core.own_cpus = perf_cpu_map__new("1,2,3");
 
 	TEST_ASSERT_VAL("failed to synthesize attr update cpus",