perf kvm: Use thread_{,_set}_priv helpers

This is mechanical changes only for accounting access to thread->priv
properly in the source level.

Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-kvm.c

···
 					  struct perf_sample *sample)
 {
 	/* Only kvm_entry records vcpu id. */
-	if (!thread->priv && kvm_entry_event(evsel)) {
+	if (!thread__priv(thread) && kvm_entry_event(evsel)) {
 		struct vcpu_event_record *vcpu_record;
 
 		vcpu_record = zalloc(sizeof(*vcpu_record));
···
 		}
 
 		vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, VCPU_ID);
-		thread->priv = vcpu_record;
+		thread__set_priv(thread, vcpu_record);
 	}
 
-	return thread->priv;
+	return thread__priv(thread);
 }
 
 static bool handle_kvm_event(struct perf_kvm_stat *kvm,