Fixing issue where we incorrectly displayed hidden files in file listings (FTPSERVER-326)

git-svn-id: https://svn.apache.org/repos/asf/mina/ftpserver/trunk@818392 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/java/org/apache/ftpserver/command/impl/listing/DirectoryLister.java b/core/src/main/java/org/apache/ftpserver/command/impl/listing/DirectoryLister.java
index af68e64..997a0af 100644
--- a/core/src/main/java/org/apache/ftpserver/command/impl/listing/DirectoryLister.java
+++ b/core/src/main/java/org/apache/ftpserver/command/impl/listing/DirectoryLister.java
@@ -75,7 +75,7 @@
         List<? extends FtpFile> files = listFiles(fileSystemView, argument.getFile());
         if (files != null) {
             FileFilter filter = null;
-            if ((argument.hasOption('a'))) {
+            if (!argument.hasOption('a')) {
                 filter = new VisibleFileFilter();
             }
             if (argument.getPattern() != null) {