-use FileUtils.close

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@502509 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -899,13 +899,7 @@ public class Zip extends MatchingTask {
                                      + "(" + ioe.getMessage() + ")", ioe,
                                      getLocation());
         } finally {
-            if (os != null) {
-                try {
-                    os.close();
-                } catch (IOException e) {
-                    //ignore
-                }
-            }
+            FileUtils.close(os);
         }
         return true;
     }