fsck_handle_reflog_sha1(): new function

New function, extracted from fsck_handle_reflog_ent(). The extra
is_null_sha1() test for the new reference is currently unnecessary, as
reflogs are deleted when the reference itself is deleted. But it
doesn't hurt, either.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fsck.c

@@ -451,28 +451,29 @@ static void fsck_dir(int i, char *path)
 
 static int default_refs;
 
-static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
-		const char *email, unsigned long timestamp, int tz,
-		const char *message, void *cb_data)
+static void fsck_handle_reflog_sha1(unsigned char *sha1)
 {
 	struct object *obj;
 
-	if (verbose)
-		fprintf(stderr, "Checking reflog %s->%s\n",
-			sha1_to_hex(osha1), sha1_to_hex(nsha1));
-
-	if (!is_null_sha1(osha1)) {
-		obj = lookup_object(osha1);
+	if (!is_null_sha1(sha1)) {
+		obj = lookup_object(sha1);
 		if (obj) {
 			obj->used = 1;
 			mark_object_reachable(obj);
 		}
 	}
-	obj = lookup_object(nsha1);
-	if (obj) {
-		obj->used = 1;
-		mark_object_reachable(obj);
-	}
+}
+
+static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+		const char *email, unsigned long timestamp, int tz,
+		const char *message, void *cb_data)
+{
+	if (verbose)
+		fprintf(stderr, "Checking reflog %s->%s\n",
+			sha1_to_hex(osha1), sha1_to_hex(nsha1));
+
+	fsck_handle_reflog_sha1(osha1);
+	fsck_handle_reflog_sha1(nsha1);
 	return 0;
 }