Reuse IOUtils.consume() which also avoids a PMD empty loop body error.

Author: Gary Gregory

src/main/java/org/apache/commons/io/input/ObservableInputStream.java

@@ -169,10 +169,7 @@ public void close() throws IOException {
      * @throws IOException The underlying {@link InputStream}, or either of the observers has thrown an exception.
      */
     public void consume() throws IOException {
-        final byte[] buffer = IOUtils.byteArray();
-        while (read(buffer) != EOF) {
-            // empty
-        }
+        IOUtils.consume(this);
     }
 
     /**