Remove unnecessary supressWarning annotation for unused

The fields were previously only accessed using reflection, but now they're directly referenced

Author: markrietveld

src/main/java/rx/internal/operators/BlockingOperatorNext.java

@@ -147,7 +147,6 @@ public void remove() {
 
     private static class NextObserver<T> extends Subscriber<Notification<? extends T>> {
         private final BlockingQueue<Notification<? extends T>> buf = new ArrayBlockingQueue<Notification<? extends T>>(1);
-        @SuppressWarnings("unused")
         final AtomicInteger waiting = new AtomicInteger();
 
         @Override

src/main/java/rx/internal/operators/OperatorConcat.java

@@ -185,7 +185,6 @@ static class ConcatInnerSubscriber<T> extends Subscriber<T> {
 
         private final Subscriber<T> child;
         private final ConcatSubscriber<T> parent;
-        @SuppressWarnings("unused")
         private final AtomicInteger once = new AtomicInteger();
         private final ProducerArbiter arbiter;