Replace == with equals()

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274922 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/vss/MSVSSLABEL.java

@@ -80,7 +80,7 @@ public class MSVSSLABEL extends MSVSS {
         }
 
         String label = getLabel();
-        if (label == "") {
+        if (label.equals("")) {
             String msg = "label attribute must be set!";
             throw new BuildException(msg, getLocation());
         }