alloc: add repository argument to alloc_blob_node

This is a small mechanical change; it doesn't change the
implementation to handle repositories other than the_repository yet.
Use a macro to catch callers passing a repository other than
the_repository at compile time.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

alloc.c

@@ -49,7 +49,7 @@ static inline void *alloc_node(struct alloc_state *s, size_t node_size)
 }
 
 static struct alloc_state blob_state;
-void *alloc_blob_node(void)
+void *alloc_blob_node_the_repository(void)
 {
 	struct blob *b = alloc_node(&blob_state, sizeof(struct blob));
 	b->object.type = OBJ_BLOB;

blob.c

@@ -9,7 +9,7 @@ struct blob *lookup_blob(const struct object_id *oid)
 	struct object *obj = lookup_object(oid->hash);
 	if (!obj)
 		return create_object(the_repository, oid->hash,
-				     alloc_blob_node());
+				     alloc_blob_node(the_repository));
 	return object_as_type(obj, OBJ_BLOB, 0);
 }
 

cache.h

@@ -1764,7 +1764,8 @@ int decode_85(char *dst, const char *line, int linelen);
 void encode_85(char *buf, const unsigned char *data, int bytes);
 
 /* alloc.c */
-extern void *alloc_blob_node(void);
+#define alloc_blob_node(r) alloc_blob_node_##r()
+extern void *alloc_blob_node_the_repository(void);
 extern void *alloc_tree_node(void);
 extern void *alloc_commit_node(void);
 extern void *alloc_tag_node(void);