Merge branch 'ps/leakfixes-part-7'

More leak-fixes.

* ps/leakfixes-part-7: (23 commits)
  diffcore-break: fix leaking filespecs when merging broken pairs
  revision: fix leaking parents when simplifying commits
  builtin/maintenance: fix leak in `get_schedule_cmd()`
  builtin/maintenance: fix leaking config string
  promisor-remote: fix leaking partial clone filter
  grep: fix leaking grep pattern
  submodule: fix leaking submodule ODB paths
  trace2: destroy context stored in thread-local storage
  builtin/difftool: plug several trivial memory leaks
  builtin/repack: fix leaking configuration
  diffcore-order: fix leaking buffer when parsing orderfiles
  parse-options: free previous value of `OPTION_FILENAME`
  diff: fix leaking orderfile option
  builtin/pull: fix leaking "ff" option
  dir: fix off by one errors for ignored and untracked entries
  builtin/submodule--helper: fix leaking remote ref on errors
  t/helper: fix leaking subrepo in nested submodule config helper
  builtin/submodule--helper: fix leaking error buffer
  builtin/submodule--helper: clear child process when not running it
  submodule: fix leaking update strategy
  ...

1 files changed, 14 insertions, 8 deletions

diff --git a/parse-options.c b/parse-options.c
index 30b9e68f8a..33bfba0ed4 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -60,12 +60,12 @@ static enum parse_opt_result get_arg(struct parse_opt_ctx_t *p,
 	return 0;
 }
 
-static void fix_filename(const char *prefix, char **file)
+static char *fix_filename(const char *prefix, const char *file)
 {
 	if (!file || !*file)
-		; /* leave as NULL */
+		return NULL;
 	else
-		*file = prefix_filename_except_for_dash(prefix, *file);
+		return prefix_filename_except_for_dash(prefix, file);
 }
 
 static enum parse_opt_result do_get_value(struct parse_opt_ctx_t *p,
@@ -129,18 +129,24 @@ static enum parse_opt_result do_get_value(struct parse_opt_ctx_t *p,
 		return 0;
 
 	case OPTION_FILENAME:
+	{
+		const char *value;
+
+		FREE_AND_NULL(*(char **)opt->value);
+
 		err = 0;
+
 		if (unset)
-			*(const char **)opt->value = NULL;
+			value = NULL;
 		else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
-			*(const char **)opt->value = (const char *)opt->defval;
+			value = (const char *) opt->defval;
 		else
-			err = get_arg(p, opt, flags, (const char **)opt->value);
+			err = get_arg(p, opt, flags, &value);
 
 		if (!err)
-			fix_filename(p->prefix, (char **)opt->value);
+			*(char **)opt->value = fix_filename(p->prefix, value);
 		return err;
-
+	}
 	case OPTION_CALLBACK:
 	{
 		const char *p_arg = NULL;