contentEquals does not throw NullPointerException (apache#496)

If either stream is null, contentEquals returns false

Author: sebbASF

src/main/java/org/apache/commons/io/IOUtils.java

@@ -894,7 +894,6 @@ public static long consume(final Reader input) throws IOException {
      * @param input2 the second stream
      * @return true if the content of the streams are equal or they both don't
      * exist, false otherwise
-     * @throws NullPointerException if either input is null
      * @throws IOException          if an I/O error occurs
      */
     public static boolean contentEquals(final InputStream input1, final InputStream input2) throws IOException {