[POWERPC] Remove warning in arch/powerpc/kernel/sysfs.c

Fixes:

arch/powerpc/kernel/sysfs.c: In function 'cpu_add_sysdev_attr_group':
arch/powerpc/kernel/sysfs.c:388: warning: ignoring return value of
'sysfs_create_group', declared with attribute warn_unused_result

Signed-off-by: Olof Johansson <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/kernel/sysfs.c

···
 {
 	int cpu;
 	struct sys_device *sysdev;
+	int ret;
 
 	mutex_lock(&cpu_mutex);
 
 	for_each_possible_cpu(cpu) {
 		sysdev = get_cpu_sysdev(cpu);
-		sysfs_create_group(&sysdev->kobj, attrs);
+		ret = sysfs_create_group(&sysdev->kobj, attrs);
+		WARN_ON(ret != 0);
 	}
 
 	mutex_unlock(&cpu_mutex);