Fix #5605 Unblock non container Threads

reorder

jetty-server/src/main/java/org/eclipse/jetty/server/HttpOutput.java

@@ -450,11 +450,12 @@ public class HttpOutput extends ServletOutputStream implements Runnable
                             break;
 
                         case BLOCKED:
+                            // An operation is in progress, so we soft close now
+                            _softClose = true;
+                            // then cancel the operation
                             CancellationException cancelled = new CancellationException();
                             if (_writeBlocker.fail(cancelled))
                                 _channel.abort(cancelled);
-                            // An operation is in progress, so we soft close now
-                            _softClose = true;
                             // then trigger a close from onWriteComplete
                             _state = State.CLOSE;
                             break;