Remove get_object_hash.

Convert all instances of get_object_hash to use an appropriate reference
to the hash member of the oid member of struct object.  This provides no
functional change, as it is essentially a macro substitution.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Jeff King <peff@peff.net>
diff --git a/tag.c b/tag.c
index ac01483..d72f742 100644
--- a/tag.c
+++ b/tag.c
@@ -10,7 +10,7 @@
 {
 	while (o && o->type == OBJ_TAG)
 		if (((struct tag *)o)->tagged)
-			o = parse_object(get_object_hash(*((struct tag *)o)->tagged));
+			o = parse_object(((struct tag *)o)->tagged->oid.hash);
 		else
 			o = NULL;
 	if (!o && warn) {
@@ -24,7 +24,7 @@
 struct object *deref_tag_noverify(struct object *o)
 {
 	while (o && o->type == OBJ_TAG) {
-		o = parse_object(get_object_hash(*o));
+		o = parse_object(o->oid.hash);
 		if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
 			o = ((struct tag *)o)->tagged;
 		else
@@ -127,7 +127,7 @@
 
 	if (item->object.parsed)
 		return 0;
-	data = read_sha1_file(get_object_hash(item->object), &type, &size);
+	data = read_sha1_file(item->object.oid.hash, &type, &size);
 	if (!data)
 		return error("Could not read %s",
 			     oid_to_hex(&item->object.oid));