Clean up object creation to use more common code

This replaces the fairly odd "created_object()" function that did _most_
of the object setup with a more complete "create_object()" function that
also has a more natural calling convention.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

alloc.c

@@ -20,7 +20,7 @@
 
 #define DEFINE_ALLOCATOR(name, type)				\
 static unsigned int name##_allocs;				\
-struct name *alloc_##name##_node(void)				\
+void *alloc_##name##_node(void)					\
 {								\
 	static int nr;						\
 	static type *block;					\