ref-filter: add braces to if/else if/else chain

Per the CodingGuidelines add braces to an if/else if/else chain where
only the "else" had braces. This is in preparation for a subsequent
change where the "else if" will have lines added to it.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ref-filter.c

@@ -2364,11 +2364,11 @@ static int cmp_ref_sorting(struct ref_sorting *s, struct ref_array_item *a, stru
 		die("%s", err.buf);
 	strbuf_release(&err);
 	cmp_fn = s->ignore_case ? strcasecmp : strcmp;
-	if (s->version)
+	if (s->version) {
 		cmp = versioncmp(va->s, vb->s);
-	else if (cmp_type == FIELD_STR)
+	} else if (cmp_type == FIELD_STR) {
 		cmp = cmp_fn(va->s, vb->s);
-	else {
+	} else {
 		if (va->value < vb->value)
 			cmp = -1;
 		else if (va->value == vb->value)