Use removeIf() for a more efficient implementation which also deals with

the PMD empty while loop error.

Author: Gary Gregory

src/main/java/org/apache/commons/io/monitor/FileAlterationMonitor.java

@@ -129,9 +129,7 @@ public Iterable<FileAlterationObserver> getObservers() {
      */
     public void removeObserver(final FileAlterationObserver observer) {
         if (observer != null) {
-            while (observers.remove(observer)) {
-                // empty
-            }
+            observers.removeIf(observer::equals);
         }
     }