agp: fix missing casts that produced a warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
index fca4d7f..d286699 100644
--- a/drivers/char/agp/amd-k7-agp.c
+++ b/drivers/char/agp/amd-k7-agp.c
@@ -54,7 +54,7 @@
 	}
 	global_cache_flush();
 #else
-	set_memory_uc(page_map->real, 1);
+	set_memory_uc((unsigned long)page_map->real, 1);
 	page_map->remapped = page_map->real;
 #endif
 
@@ -72,7 +72,7 @@
 	iounmap(page_map->remapped);
 	ClearPageReserved(virt_to_page(page_map->real));
 #else
-	set_memory_wb(page_map->real, 1);
+	set_memory_wb((unsigned long)page_map->real, 1);
 #endif
 	free_page((unsigned long) page_map->real);
 }