8266796: Clean up the unnecessary code in the method UnsharedNameTable#fromUtf

Reviewed-by: mcimadamore

Author: lgxbslgx

src/jdk.compiler/share/classes/com/sun/tools/javac/util/UnsharedNameTable.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -96,10 +96,6 @@ public Name fromUtf(byte[] cs, int start, int len) {
         HashEntry firstTableEntry = element;
 
         while (element != null) {
-            if (element == null) {
-                break;
-            }
-
             n = element.get();
 
             if (n == null) {