phonet: Protect if_phonet.h against multiple inclusions.

From: Remi Denis-Courmont <[e-mail]>

Signed-off-by: David S. Miller <[e-mail]>

include/linux/if_phonet.h

···
  *
  * Copyright (C) 2008 Nokia Corporation. All rights reserved.
  */
+#ifndef LINUX_IF_PHONET_H
+#define LINUX_IF_PHONET_H
 
-#define PHONET_HEADER_LEN	8	/* Phonet header length */
-
-#define PHONET_MIN_MTU		6
-/* 6 bytes header + 65535 bytes payload */
-#define PHONET_MAX_MTU		65541
+#define PHONET_MIN_MTU		6	/* pn_length = 0 */
+#define PHONET_MAX_MTU		65541	/* pn_length = 0xffff */
 #define PHONET_DEV_MTU		PHONET_MAX_MTU
 
 #ifdef __KERNEL__
 extern struct header_ops phonet_header_ops;
+#endif
+
 #endif