Eliminate the follow clang warning:

arch/x86/events/amd/core.c:774:24: warning: variable 'hwc' set but not
used [-Wunused-but-set-variable].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 arch/x86/events/amd/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 47ef8aee15d2..78076904daad 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -771,13 +771,11 @@ static void amd_pmu_enable_event(struct perf_event *event)
 static void amd_pmu_enable_all(int added)
 {
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
-	struct hw_perf_event *hwc;
 	int idx;
 
 	amd_brs_enable_all();
 
 	for (idx = 0; idx < x86_pmu.num_counters; idx++) {
-		hwc = &cpuc->events[idx]->hw;
 
 		/* only activate events which are marked as active */
 		if (!test_bit(idx, cpuc->active_mask))
-- 
2.20.1.7.g153144c