ref-filter: add `ref_filter_clear()`

We did not bother to clean up at all in `git branch` or `git tag`, and
`git for-each-ref` only cleans up a couple of members.

Add and call `ref_filter_clear()` when cleaning up a `struct
ref_filter`. Running this patch (without any test changes) indicates a
couple of now leak-free tests. This was found by running:

    $ make SANITIZE=leak
    $ make -C t GIT_TEST_PASSING_SANITIZE_LEAK=check GIT_TEST_OPTS=--immediate

(Note that the `reachable_from` and `unreachable_from` lists should be
cleaned as they are used. So this is just covering any case where we
might bail before running the reachability check.)

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/ref-filter.c b/ref-filter.c
index 048d277..d32f426 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2866,3 +2866,19 @@ int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
 
 	return 0;
 }
+
+void ref_filter_init(struct ref_filter *filter)
+{
+	struct ref_filter blank = REF_FILTER_INIT;
+	memcpy(filter, &blank, sizeof(blank));
+}
+
+void ref_filter_clear(struct ref_filter *filter)
+{
+	oid_array_clear(&filter->points_at);
+	free_commit_list(filter->with_commit);
+	free_commit_list(filter->no_commit);
+	free_commit_list(filter->reachable_from);
+	free_commit_list(filter->unreachable_from);
+	ref_filter_init(filter);
+}