scsi: ch: add include guard to chio.h

Add a header include guard just in case.

Link: https://lore.kernel.org/r/20190728164643.16335-1-yamada.masahiro@socionext.comSigned-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

include/uapi/linux/chio.h

@@ -3,6 +3,9 @@
  * ioctl interface for the scsi media changer driver
  */
 
+#ifndef _UAPI_LINUX_CHIO_H
+#define _UAPI_LINUX_CHIO_H
+
 /* changer element types */
 #define CHET_MT   0	/* media transport element (robot) */
 #define CHET_ST   1	/* storage element (media slots) */
@@ -160,10 +163,4 @@ struct changer_set_voltag {
 #define CHIOSVOLTAG    _IOW('c',18,struct changer_set_voltag)
 #define CHIOGVPARAMS   _IOR('c',19,struct changer_vendor_params)
 
-/* ---------------------------------------------------------------------- */
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
+#endif /* _UAPI_LINUX_CHIO_H */