[CPUFREQ] Fix another notifier leak in powernow-k8.

Do the notifier registration later, so we don't have to worry
about freeing it if we fail the msr allocation.

Signed-off-by: Dave Jones <davej@redhat.com>

arch/x86/kernel/cpu/cpufreq/powernow-k8.c

@@ -1556,14 +1556,14 @@ static int __cpuinit powernowk8_init(void)
 
 		cpb_capable = true;
 
-		register_cpu_notifier(&cpb_nb);
-
 		msrs = msrs_alloc();
 		if (!msrs) {
 			printk(KERN_ERR "%s: Error allocating msrs!\n", __func__);
 			return -ENOMEM;
 		}
 
+		register_cpu_notifier(&cpb_nb);
+
 		rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
 
 		for_each_cpu(cpu, cpu_online_mask) {