[RFC PATCH v2 4/4] branch: use ref_sorting_release()

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Use a ref_sorting_release() in branch.c to free the memory from the
ref_sorting_options(). This plugs the final in-tree memory leak of
that API.

In the preceding commit the "sorting" variable was left in the
cmd_branch() scope, even though that wasn't needed anymore. Move it to
the "else if (list)" scope instead. We can also move the "struct
string_list" only used for that branch to be declared in that block

That "struct ref_sorting" does not need to be "static" (and isn't
re-used). The "ref_sorting_options()" will return a valid one, we
don't need to make it "static" to have it zero'd out. That it was
static was another artifact of the pre-image of the preceding commit.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/branch.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index 69211f8dd1c..3963c592f56 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -69,7 +69,6 @@ static const char *color_branch_slots[] = {
 	[BRANCH_COLOR_WORKTREE] = "worktree",
 };
 
-static struct string_list output = STRING_LIST_INIT_DUP;
 static unsigned int colopts;
 
 define_list_config_array(color_branch_slots);
@@ -406,7 +405,8 @@ static char *build_format(struct ref_filter *filter, int maxwidth, const char *r
 	return strbuf_detach(&fmt, NULL);
 }
 
-static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sorting, struct ref_format *format)
+static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sorting,
+			   struct ref_format *format, struct string_list *output)
 {
 	int i;
 	struct ref_array array;
@@ -448,7 +448,7 @@ static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sortin
 		if (column_active(colopts)) {
 			assert(!filter->verbose && "--column and --verbose are incompatible");
 			 /* format to a string_list to let print_columns() do its job */
-			string_list_append(&output, out.buf);
+			string_list_append(output, out.buf);
 		} else {
 			fwrite(out.buf, 1, out.len, stdout);
 			putchar('\n');
@@ -623,7 +623,6 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	enum branch_track track;
 	struct ref_filter filter;
 	int icase = 0;
-	static struct ref_sorting *sorting;
 	struct string_list sorting_options = STRING_LIST_INIT_DUP;
 	struct ref_format format = REF_FORMAT_INIT;
 
@@ -737,6 +736,9 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		print_current_branch_name();
 		return 0;
 	} else if (list) {
+		struct ref_sorting *sorting;
+		static struct string_list output = STRING_LIST_INIT_DUP;
+
 		/*  git branch --list also shows HEAD when it is detached */
 		if ((filter.kind & FILTER_REFS_BRANCHES) && filter.detached)
 			filter.kind |= FILTER_REFS_DETACHED_HEAD;
@@ -752,9 +754,10 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
 		ref_sorting_set_sort_flags_all(
 			sorting, REF_SORTING_DETACHED_HEAD_FIRST, 1);
-		print_ref_list(&filter, sorting, &format);
+		print_ref_list(&filter, sorting, &format, &output);
 		print_columns(&output, colopts, NULL);
 		string_list_clear(&output, 0);
+		ref_sorting_release(sorting);
 		return 0;
 	} else if (edit_description) {
 		const char *branch_name;
-- 
2.33.1.1338.g20da966911a