[IA64] Fix unlock ordering in smp_callin

One should normally unlock in the reverse order of the lock calls,
and in this case there certainly is no reason not to.
Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/smpboot.c

@@ -400,9 +400,9 @@ smp_callin (void)
 	/* Setup the per cpu irq handling data structures */
 	__setup_vector_irq(cpuid);
 	cpu_set(cpuid, cpu_online_map);
-	unlock_ipi_calllock();
 	per_cpu(cpu_state, cpuid) = CPU_ONLINE;
 	spin_unlock(&vector_lock);
+	unlock_ipi_calllock();
 
 	smp_setup_percpu_timer();