Always ack IPIs even on errors

Index: linux/arch/x86_64/kernel/smp.c
===================================================================
--- linux.orig/arch/x86_64/kernel/smp.c	2005-04-03 23:13:16.%N +0200
+++ linux/arch/x86_64/kernel/smp.c	2005-04-14 14:29:25.%N +0200
@@ -129,10 +129,9 @@
 		} else
 			leave_mm(cpu);
 	}
+out:
 	ack_APIC_irq();
 	cpu_clear(cpu, flush_cpumask);
-
-out:
 	put_cpu_no_resched();
 }