[PATCH] fix build error if CONFIG_SYSFS=n

uevent_seqnum and uevent_helper are only defined if CONFIG_HOTPLUG=y,
CONFIG_NET=n.

(I stole this back from Greg's tree - it makes allnoconfig work).

Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/ksysfs.c

@@ -22,7 +22,7 @@ static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
 static struct subsys_attribute _name##_attr = \
 	__ATTR(_name, 0644, _name##_show, _name##_store)
 
-#ifdef CONFIG_HOTPLUG
+#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 /* current uevent sequence number */
 static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page)
 {
@@ -52,7 +52,7 @@ decl_subsys(kernel, NULL, NULL);
 EXPORT_SYMBOL_GPL(kernel_subsys);
 
 static struct attribute * kernel_attrs[] = {
-#ifdef CONFIG_HOTPLUG
+#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
 	&uevent_seqnum_attr.attr,
 	&uevent_helper_attr.attr,
 #endif