perf parse-events: Add debug logging to perf_event

If verbose is enabled and parse_event is called, typically by tests,
log failures.

Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/util/parse-events.c

@@ -2236,6 +2236,8 @@ int parse_event(struct evlist *evlist, const char *str)
 
 	parse_events_error__init(&err);
 	ret = parse_events(evlist, str, &err);
+	if (ret && verbose > 0)
+		parse_events_error__print(&err, str);
 	parse_events_error__exit(&err);
 	return ret;
 }