UAPI: Guard linux/isdn_divertif.h

Place reinclusion guards on linux/isdn_divertif.h otherwise the UAPI splitter
script won't insert the #include to include the UAPI header from the kernel
header.
Signed-off-by: David Howells <dhowells@redhat.com>

include/linux/isdn_divertif.h

@@ -10,6 +10,8 @@
  *
  */
 
+#ifndef _LINUX_ISDN_DIVERTIF_H
+#define _LINUX_ISDN_DIVERTIF_H
 
 /***********************************************************/
 /* magic value is also used to control version information */
@@ -45,3 +47,5 @@ typedef struct
 /*********************/
 extern int DIVERT_REG_NAME(isdn_divert_if *);
 #endif
+
+#endif /* _LINUX_ISDN_DIVERTIF_H */