[PATCH v3 4/6] notes.c: replace `git_config()` with `git_config_get_value()`

[Tanay Abhra <tanayabh@gmail.com>]

Use `git_config_get_value()` instead of `git_config()` to take advantage of
the config-set API which provides a cleaner control flow, also previously
'string_list_add_refs_by_glob()' was called even when the retrieved value
was NULL, correct it while we are at it.

Signed-off-by: Tanay Abhra <tanayabh@gmail.com>
---
 notes.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/notes.c b/notes.c
index 5fe691d..20c20f5 100644
--- a/notes.c
+++ b/notes.c
@@ -961,19 +961,6 @@ void string_list_add_refs_from_colon_sep(struct string_list *list,
 	free(globs_copy);
 }
 
-static int notes_display_config(const char *k, const char *v, void *cb)
-{
-	int *load_refs = cb;
-
-	if (*load_refs && !strcmp(k, "notes.displayref")) {
-		if (!v)
-			config_error_nonbool(k);
-		string_list_add_refs_by_glob(&display_notes_refs, v);
-	}
-
-	return 0;
-}
-
 const char *default_notes_ref(void)
 {
 	const char *notes_ref = NULL;
@@ -1041,6 +1028,7 @@ struct notes_tree **load_notes_trees(struct string_list *refs)
 void init_display_notes(struct display_notes_opt *opt)
 {
 	char *display_ref_env;
+	const char *value = NULL;
 	int load_config_refs = 0;
 	display_notes_refs.strdup_strings = 1;
 
@@ -1058,7 +1046,12 @@ void init_display_notes(struct display_notes_opt *opt)
 			load_config_refs = 1;
 	}
 
-	git_config(notes_display_config, &load_config_refs);
+	if (load_config_refs && !git_config_get_value("notes.displayref", &value)) {
+		if (!value)
+			config_error_nonbool("notes.displayref");
+		else
+			string_list_add_refs_by_glob(&display_notes_refs, value);
+	}
 
 	if (opt) {
 		struct string_list_item *item;
-- 
1.9.0.GIT