Only ensured tablength was even, not it was a power of 2.

Good to know others read my patches.

Submitted by:	Sam Ruby <rubys@us.ibm.com>,
                Fergus Gallagher <Fergus.Gallagher@OrbisUK.com>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267755 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/FixCRLF.java

@@ -179,7 +179,7 @@ public class FixCRLF extends MatchingTask {
      * @param tlength specify the length of tab in spaces, has to be a power of 2
      */
     public void setTablength(int tlength) throws BuildException {
-        if (tlength < 2 || (tlength % 2) != 0) {
+        if (tlength < 2 || (tlength & (tlength-1)) == 0) {
             throw new BuildException("tablength must be a positive power of 2",
                                      location);
         }