include/linux/vgaarb.h: add missing part of include guard

vgaarb.h was missing the #define of the #ifndef at the top for the guard
to prevent multiple #include's from causing re-define errors

Signed-off-by: Doug Goldstein <cardoe@gentoo.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index c9a9759..814f294 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -29,6 +29,7 @@
  */
 
 #ifndef LINUX_VGA_H
+#define LINUX_VGA_H
 
 #include <asm/vga.h>