agp: more boolean conversions.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/linux/agp_backend.h b/include/linux/agp_backend.h
index 09b4478..972b12b 100644
--- a/include/linux/agp_backend.h
+++ b/include/linux/agp_backend.h
@@ -77,7 +77,7 @@
 	u32 physical;
 	bool is_bound;
 	bool is_flushed;
-        u8 vmalloc_flag;
+        bool vmalloc_flag;
 };
 
 #define AGP_NORMAL_MEMORY 0