[PATCH] uml ubd driver: use bitfields where possible

Use bitfields for boolean fields in ubd data structure.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/drivers/ubd_kern.c

@@ -174,8 +174,8 @@ struct ubd {
 	__u64 size;
 	struct openflags boot_openflags;
 	struct openflags openflags;
-	int shared;
-	int no_cow;
+	unsigned shared:1;
+	unsigned no_cow:1;
 	struct cow cow;
 	struct platform_device pdev;
 };