clone: fix memory leak in wanted_peer_refs()

Fix a memory leak added in 0ec4b16 (clone: fix ref selection in
--single-branch --branch=xxx, 2012-06-22).

Whether we get our "remote_head" from copy_ref() directly, or with a
call to guess_remote_head() it'll be the result of a copy_ref() in
either case, as guess_remote_head() is a wrapper for copy_ref() (or it
returns NULL).

We can't mark any tests passing passing with SANITIZE=leak using
"TEST_PASSES_SANITIZE_LEAK=true" as a result of this change, but
e.g. "t/t1500-rev-parse.sh" now gets closer to passing.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

builtin/clone.c

@@ -494,6 +494,7 @@ static struct ref *wanted_peer_refs(const struct ref *refs,
 			/* if --branch=tag, pull the requested tag explicitly */
 			get_fetch_map(remote_head, tag_refspec, &tail, 0);
 		}
+		free_refs(remote_head);
 	} else {
 		int i;
 		for (i = 0; i < refspec->nr; i++)