perf/x86: Fix sparse warnings

FYI, there are new sparse warnings:

 arch/x86/kernel/cpu/perf_event.c:1356:18: sparse: symbol 'events_attr' was not declared. Should it be static?

This patch makes it static and also adds the static keyword to
fix arch/x86/kernel/cpu/perf_event.c:1344:9: warning: symbol
'events_sysfs_show' was not declared.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Cc: fengguang.wu@intel.com
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-lerdpXlnruh0yvWs2owwuizl@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/cpu/perf_event.c

@@ -1341,7 +1341,7 @@ static void __init filter_events(struct attribute **attrs)
 	}
 }
 
-ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
+static ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
 			  char *page)
 {
 	struct perf_pmu_events_attr *pmu_attr = \
@@ -1373,7 +1373,7 @@ EVENT_ATTR(ref-cycles,			REF_CPU_CYCLES		);
 
 static struct attribute *empty_attrs;
 
-struct attribute *events_attr[] = {
+static struct attribute *events_attr[] = {
 	EVENT_PTR(CPU_CYCLES),
 	EVENT_PTR(INSTRUCTIONS),
 	EVENT_PTR(CACHE_REFERENCES),