perf evsel: Delete the event selectors at exit

Freeing all the possibly allocated resources, reducing complexity
on each tool exit path.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -982,3 +982,14 @@ int perf_evsel_list__create_default(void)
 	++nr_counters;
 	return 0;
 }
+
+void perf_evsel_list__delete(void)
+{
+	struct perf_evsel *pos, *n;
+
+	list_for_each_entry_safe(pos, n, &evsel_list, node) {
+		list_del_init(&pos->node);
+		perf_evsel__delete(pos);
+	}
+	nr_counters = 0;
+}