Merge branch 'jh/hash-init-fixes'

An earlier code refactoring of the hash machinery missed a few
required calls to init_fn.

* jh/hash-init-fixes:
  index-pack, unpack-objects: restore missing ->init_fn

builtin/index-pack.c

@@ -1286,6 +1286,7 @@ static void parse_pack_objects(unsigned char *hash)
 
 	/* Check pack integrity */
 	flush();
+	the_hash_algo->init_fn(&tmp_ctx);
 	git_hash_clone(&tmp_ctx, &input_ctx);
 	git_hash_final(hash, &tmp_ctx);
 	if (!hasheq(fill(the_hash_algo->rawsz), hash, the_repository->hash_algo))