x86, ipi: Clean up safe_smp_processor_id() by using the cpu_has_apic() macro helper

We already use a lot of cpu_has_ helpers.
Lets do here the same for consistency.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090705160154.GB4791@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/apic/ipi.c

@@ -150,7 +150,7 @@ int safe_smp_processor_id(void)
 {
 	int apicid, cpuid;
 
-	if (!boot_cpu_has(X86_FEATURE_APIC))
+	if (!cpu_has_apic)
 		return 0;
 
 	apicid = hard_smp_processor_id();