include/linux/hdreg.h: cover struct hd_driveid with #ifndef/#endif __KERNEL__

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/hdreg.h b/include/linux/hdreg.h
index ed21bd3..47fcb05 100644
--- a/include/linux/hdreg.h
+++ b/include/linux/hdreg.h
@@ -448,6 +448,7 @@
 
 #define __NEW_HD_DRIVE_ID
 
+#ifndef __KERNEL__
 /*
  * Structure returned by HDIO_GET_IDENTITY, as per ANSI NCITS ATA6 rev.1b spec.
  *
@@ -699,6 +700,7 @@
 					 *  7:0 Signature
 					 */
 };
+#endif /* __KERNEL__ */
 
 /*
  * IDE "nice" flags. These are used on a per drive basis to determine