MIPS/Perf-events: Cleanup event->destroy at event init

Simplify the code by changing the place of event->destroy().
Signed-off-by: Deng-Cheng Zhu <dczhu@mips.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: David Daney <david.daney@cavium.com>
Cc: Eyal Barzilay <eyal@mips.com>
Cc: Zenon Fortuna <zenon@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/3109/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/perf_event_mipsxx.c

@@ -633,11 +633,7 @@ static int mipspmu_event_init(struct perf_event *event)
 	if (err)
 		return err;
 
-	err = __hw_perf_event_init(event);
-	if (err)
-		hw_perf_event_destroy(event);
-
-	return err;
+	return __hw_perf_event_init(event);
 }
 
 static struct pmu pmu = {
@@ -1262,13 +1258,14 @@ static int __hw_perf_event_init(struct perf_event *event)
 	}
 
 	err = 0;
-	if (event->group_leader != event) {
+	if (event->group_leader != event)
 		err = validate_group(event);
-		if (err)
-			return -EINVAL;
-	}
 
 	event->destroy = hw_perf_event_destroy;
+
+	if (err)
+		event->destroy(event);
+
 	return err;
 }