builtin/clone: plug leaking HEAD ref in wanted_peer_refs()

In `wanted_peer_refs()` we first create a copy of the "HEAD" ref. This
copy may not actually be passed back to the caller, but is not getting
freed in this case. Fix this.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

builtin/clone.c

@@ -530,7 +530,8 @@ static struct ref *wanted_peer_refs(const struct ref *refs,
 		if (!option_branch)
 			remote_head = guess_remote_head(head, refs, 0);
 		else {
-			local_refs = NULL;
+			free_one_ref(head);
+			local_refs = head = NULL;
 			tail = &local_refs;
 			remote_head = copy_ref(find_remote_branch(refs, option_branch));
 		}

t/t5300-pack-object.sh

@@ -3,9 +3,9 @@
 # Copyright (c) 2005 Junio C Hamano
 #
 
-test_description='git pack-object
+test_description='git pack-object'
 
-'
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '

t/t5305-include-tag.sh

@@ -4,6 +4,7 @@ test_description='git pack-object --include-tag'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 TRASH=$(pwd)

t/t5612-clone-refspec.sh

@@ -4,6 +4,7 @@ test_description='test refspec written by clone-command'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '