Don't include agp_backend.h in user-visible part of agpgart.h

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/include/linux/agpgart.h b/include/linux/agpgart.h
index 6d59c8e..bfb8ec7 100644
--- a/include/linux/agpgart.h
+++ b/include/linux/agpgart.h
@@ -27,8 +27,6 @@
 #ifndef _AGP_H
 #define _AGP_H 1
 
-#include <linux/agp_backend.h>
-
 #define AGPIOC_BASE       'A'
 #define AGPIOC_INFO       _IOR (AGPIOC_BASE, 0, struct agp_info*)
 #define AGPIOC_ACQUIRE    _IO  (AGPIOC_BASE, 1)
@@ -112,6 +110,7 @@
 
 #else				/* __KERNEL__ */
 #include <linux/mutex.h>
+#include <linux/agp_backend.h>
 
 #define AGPGART_MINOR 175