libperf tests: Update a use of the new cpumap API

Fixes a build breakage.

Fixes: 6d18804b ("perf cpumap: Give CPUs their own type")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: colin ian king <colin.king@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shunsuke Nakamura <nakamura.shun@fujitsu.com>
Link: http://lore.kernel.org/lkml/20220114065105.1806542-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/perf/tests/test-evlist.c

@@ -334,7 +334,8 @@ static int test_mmap_cpus(void)
 	};
 	cpu_set_t saved_mask;
 	char path[PATH_MAX];
-	int id, err, cpu, tmp;
+	int id, err, tmp;
+	struct perf_cpu cpu;
 	union perf_event *event;
 	int count = 0;
 
@@ -377,7 +378,7 @@ static int test_mmap_cpus(void)
 		cpu_set_t mask;
 
 		CPU_ZERO(&mask);
-		CPU_SET(cpu, &mask);
+		CPU_SET(cpu.cpu, &mask);
 
 		err = sched_setaffinity(0, sizeof(mask), &mask);
 		__T("sched_setaffinity failed", err == 0);