perf/amd/uncore: Simplify code, use free_percpu()'s built-in check for NULL

mainline inclusion
from mainline-v5.15-rc1
commit 6cf295b2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I65D55
CVE: NA

--------------------------------

free_percpu() has its own check for NULL, no need to open-code it.
Signed-off-by: NKim Phillips <kim.phillips@amd.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210817221048.88063-5-kim.phillips@amd.comSigned-off-by: NXie Haocheng <haocheng.xie@amd.com>

arch/x86/events/amd/uncore.c

@@ -755,11 +755,9 @@ static int __init amd_uncore_init(void)
 fail_llc:
 	if (boot_cpu_has(X86_FEATURE_PERFCTR_NB))
 		perf_pmu_unregister(&amd_nb_pmu);
-	if (amd_uncore_llc)
-		free_percpu(amd_uncore_llc);
+	free_percpu(amd_uncore_llc);
 fail_nb:
-	if (amd_uncore_nb)
-		free_percpu(amd_uncore_nb);
+	free_percpu(amd_uncore_nb);
 
 	return ret;
 }