merge-recursive: fix memory leak when finalizing merge

We do not free some members of `struct merge_options`' private data.
Fix this to plug those leaks.

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

Author: pks-t

merge-recursive.c

@@ -3800,6 +3800,9 @@ static void merge_finalize(struct merge_options *opt)
 	if (show(opt, 2))
 		diff_warn_rename_limit("merge.renamelimit",
 				       opt->priv->needed_rename_limit, 0);
+	hashmap_clear_and_free(&opt->priv->current_file_dir_set,
+			       struct path_hashmap_entry, e);
+	string_list_clear(&opt->priv->df_conflict_file_set, 0);
 	FREE_AND_NULL(opt->priv);
 }
 

t/t1004-read-tree-m-u-wf.sh

@@ -5,6 +5,7 @@ test_description='read-tree -m -u checks working tree files'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 

t/t1015-read-index-unmerged.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Test various callers of read_index_unmerged'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup modify/delete + directory/file conflict' '

t/t3509-cherry-pick-merge-df.sh

@@ -4,6 +4,7 @@ test_description='Test cherry-pick with directory/file conflicts'
 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 'Initialize repository' '