fixed a regression in safeRestart since 1.376

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@35422 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Hudson.java

@@ -2494,7 +2494,7 @@ public final class Hudson extends Node implements ItemGroup<TopLevelItem>, Stapl
             if (timeout > 0) timeout += System.currentTimeMillis();
             while (isQuietingDown
                    && (timeout <= 0 || System.currentTimeMillis() < timeout)
-                   && RestartListener.isAllReady()) {
+                   && !RestartListener.isAllReady()) {
                 Thread.sleep(1000);
             }
         }