rename_ref(): remove unneeded local variable

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>

refs/files-backend.c

@@ -2360,20 +2360,17 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
 	struct ref_lock *lock;
 	struct stat loginfo;
 	int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
-	const char *symref = NULL;
 	struct strbuf err = STRBUF_INIT;
 
 	if (log && S_ISLNK(loginfo.st_mode))
 		return error("reflog for %s is a symlink", oldrefname);
 
-	symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING,
-				    orig_sha1, &flag);
+	if (!resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING, orig_sha1, &flag))
+		return error("refname %s not found", oldrefname);
+
 	if (flag & REF_ISSYMREF)
 		return error("refname %s is a symbolic ref, renaming it is not supported",
 			oldrefname);
-	if (!symref)
-		return error("refname %s not found", oldrefname);
-
 	if (!rename_ref_available(oldrefname, newrefname))
 		return 1;