refs: pass NULL to resolve_ref_unsafe() if hash is not needed

This allows us to get rid of some write-only variables, among them seven
SHA1 buffers.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/remote.c b/remote.c
index 4113090069..b220f0dfc6 100644
--- a/remote.c
+++ b/remote.c
@@ -466,7 +466,6 @@ static void alias_all_urls(void)
 static void read_config(void)
 {
 	static int loaded;
-	struct object_id oid;
 	int flag;
 
 	if (loaded)
@@ -475,7 +474,7 @@ static void read_config(void)
 
 	current_branch = NULL;
 	if (startup_info->have_repository) {
-		const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
+		const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
 		if (head_ref && (flag & REF_ISSYMREF) &&
 		    skip_prefix(head_ref, "refs/heads/", &head_ref)) {
 			current_branch = make_branch(head_ref, 0);
@@ -1105,10 +1104,9 @@ static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 static char *guess_ref(const char *name, struct ref *peer)
 {
 	struct strbuf buf = STRBUF_INIT;
-	struct object_id oid;
 
 	const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
-					   oid.hash, NULL);
+					   NULL, NULL);
 	if (!r)
 		return NULL;
 
@@ -1166,12 +1164,11 @@ static int match_explicit(struct ref *src, struct ref *dst,
 		return -1;
 
 	if (!dst_value) {
-		struct object_id oid;
 		int flag;
 
 		dst_value = resolve_ref_unsafe(matched_src->name,
 					       RESOLVE_REF_READING,
-					       oid.hash, &flag);
+					       NULL, &flag);
 		if (!dst_value ||
 		    ((flag & REF_ISSYMREF) &&
 		     !starts_with(dst_value, "refs/heads/")))
@@ -1792,10 +1789,9 @@ const char *branch_get_push(struct branch *branch, struct strbuf *err)
 
 static int ignore_symref_update(const char *refname)
 {
-	struct object_id oid;
 	int flag;
 
-	if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
+	if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
 		return 0; /* non-existing refs are OK */
 	return (flag & REF_ISSYMREF);
 }