diff: free state populated via options

The `objfind` and `anchors` members of `struct diff_options` are
populated via option parsing, but are never freed in `diff_free()`. Fix
this to plug those memory leaks.

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

diff.c

@@ -6717,6 +6717,16 @@ void diff_free(struct diff_options *options)
 	if (options->no_free)
 		return;
 
+	if (options->objfind) {
+		oidset_clear(options->objfind);
+		FREE_AND_NULL(options->objfind);
+	}
+
+	for (size_t i = 0; i < options->anchors_nr; i++)
+		free(options->anchors[i]);
+	FREE_AND_NULL(options->anchors);
+	options->anchors_nr = options->anchors_alloc = 0;
+
 	diff_free_file(options);
 	diff_free_ignore_regex(options);
 	clear_pathspec(&options->pathspec);

t/t4064-diff-oidfind.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test finding specific blobs in the revision walking'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup ' '

t/t4065-diff-anchored.sh

@@ -2,6 +2,7 @@
 
 test_description='anchored diff algorithm'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success '--anchored' '

t/t4069-remerge-diff.sh

@@ -2,6 +2,7 @@
 
 test_description='remerge-diff handling'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This test is ort-specific