8023878: (fs) TEST_BUG java/nio/file/WatchService/SensitivityModifier.java fails intermittently

Reviewed-by: alanb
Contributed-by: yiming.wang@oracle.com

test/java/nio/file/WatchService/SensitivityModifier.java

@@ -100,7 +100,7 @@ public class SensitivityModifier {
                     }
                     key.reset();
                     key = watcher.poll(1, TimeUnit.SECONDS);
-                } while (key != null && !eventReceived);
+                } while (key != null);
 
                 // we should have received at least one ENTRY_MODIFY event
                 if (eventReceived) {