Fixed detection of duplicate entries in <jlink>.

Submitted by:	Matthew Kuperus Heun <matthew.k.heun@gaerospace.com>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268053 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/jlink/jlink.java

@@ -236,7 +236,7 @@ public class jlink extends Object{
         		    //In that case, just ignore the error and go on to the
         		    //next entry.
     		        String mess = ex.getMessage();
-    		        if (mess.indexOf("duplicate") > 0){
+    		        if (mess.indexOf("duplicate") >= 0){
     		            //It was the duplicate entry.
     		            continue;
     		        } else {