Wrong condition in flush, submitted by Martijn Kruithof, PR: 27549

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276217 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/zip/ZipOutputStream.java

@@ -504,7 +504,7 @@ public class ZipOutputStream extends FilterOutputStream {
      * @since 1.14
      */
     public void flush() throws IOException {
-        if (out == null) {
+        if (out != null) {
             out.flush();
         }
     }