selinux: sparse fix: fix warnings in netlink code

Fix sparse warnings in SELinux Netlink code.

Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 13b6263..d871e8a 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -221,6 +221,9 @@
 extern void exit_sel_fs(void);
 extern struct dentry *selinux_null;
 extern struct vfsmount *selinuxfs_mount;
+extern void selnl_notify_setenforce(int val);
+extern void selnl_notify_policyload(u32 seqno);
+extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 
 #endif /* _SELINUX_SECURITY_H_ */