perf/x86/amd: Remove unused variable 'hwc'

'hwc' is never used in amd_pmu_enable_all(), so remove it.
Signed-off-by: NZucheng Zheng <zhengzucheng@huawei.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220421111031.174698-1-zhengzucheng@huawei.com

arch/x86/events/amd/core.c

@@ -771,14 +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))
 			continue;