perf event: Prevent unbound event__name array access

event__name[] is missing an entry for PERF_RECORD_FINISHED_ROUND, but we
happily access the array from the dump code.

Make event__name[] static and provide an accessor function, fix up all
callers and add the missing string.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20101207124550.432593943@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index a95ab18..4716a8f 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -171,6 +171,6 @@
 int event__parse_sample(const event_t *event, struct perf_session *session,
 			struct sample_data *sample);
 
-extern const char *event__name[];
+const char *event__get_event_name(unsigned int id);
 
 #endif /* __PERF_RECORD_H */