Fix obvious cut/paste error in output stream management code.

git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@2313 348d0f76-0448-11de-a6fe-93d51630548a

java/src/org/broadinstitute/sting/gatk/io/storage/OutputStreamStorage.java

@@ -80,7 +80,7 @@ public class OutputStreamStorage extends OutputStream implements Storage<OutputS
      * @{inheritDoc}
      */
     public void flush() throws IOException {
-        outputStream.close();
+        outputStream.flush();
     }
 
     /**