Inline a single use variable.

Author: Gary Gregory

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

@@ -65,8 +65,7 @@ static Thread start(final Thread thread, final Duration timeout) {
         if (timeout.isZero() || timeout.isNegative()) {
             return null;
         }
-        final ThreadMonitor timout = new ThreadMonitor(thread, timeout);
-        final Thread monitor = new Thread(timout, ThreadMonitor.class.getSimpleName());
+        final Thread monitor = new Thread(new ThreadMonitor(thread, timeout), ThreadMonitor.class.getSimpleName());
         monitor.setDaemon(true);
         monitor.start();
         return monitor;