agp: more boolean conversions.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/linux/agpgart.h b/include/linux/agpgart.h
index 62aef58..c8fdb6e 100644
--- a/include/linux/agpgart.h
+++ b/include/linux/agpgart.h
@@ -206,8 +206,8 @@
 	struct agp_controller *current_controller;
 	struct agp_controller *controllers;
 	struct agp_file_private *file_priv_list;
-	u8 used_by_controller;
-	u8 backend_acquired;
+	bool used_by_controller;
+	bool backend_acquired;
 };
 
 #endif				/* __KERNEL__ */