perf cpumap: Remove initializations done in perf_cpu_map__alloc()

When extracting this patch from Ian's original patch I forgot to remove
the setting of ->nr and ->refcnt, no need to do those initializations
again as those are done in perf_cpu_map__alloc() already, duh.

Cc: Ian Rogers <irogers@google.com>
Fixes: 1f94479e ("libperf: Make perf_cpu_map__alloc() available as an internal function for tools/perf to use")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/cpumap.c

@@ -163,13 +163,8 @@ struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
 	struct perf_cpu_map *cpus = perf_cpu_map__alloc(nr);
 
 	if (cpus != NULL) {
-		int i;
-
-		cpus->nr = nr;
-		for (i = 0; i < nr; i++)
+		for (int i = 0; i < nr; i++)
 			cpus->map[i].cpu = -1;
-
-		refcount_set(&cpus->refcnt, 1);
 	}
 
 	return cpus;