x86: fix preempt_enable_no_resched usage

Triggers the missed preemption check.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/process_32.c

@@ -118,7 +118,7 @@ void cpu_idle(void)
 			start_critical_timings();
 		}
 		tick_nohz_restart_sched_tick();
-		preempt_enable_no_resched();
+		__preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
 	}

arch/x86/kernel/process_64.c

@@ -152,7 +152,7 @@ void cpu_idle(void)
 		}
 
 		tick_nohz_restart_sched_tick();
-		preempt_enable_no_resched();
+		__preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
 	}