Merge branch 'nd/upload-pack-shallow-must-be-commit'

A minor consistency check patch that does not have much relevance
to the real world.

* nd/upload-pack-shallow-must-be-commit:
  upload-pack: only accept commits from "shallow" line

Author: gitster

upload-pack.c

@@ -603,6 +603,8 @@ static void receive_needs(void)
 			object = parse_object(sha1);
 			if (!object)
 				die("did not find object for %s", line);
+			if (object->type != OBJ_COMMIT)
+				die("invalid shallow object %s", sha1_to_hex(sha1));
 			object->flags |= CLIENT_SHALLOW;
 			add_object_array(object, NULL, &shallows);
 			continue;