Fixes #1305 ensure that ConcurrentBag.add() does not spin under high load, when waiting threads may never reach 0.

src/main/java/com/zaxxer/hikari/util/ConcurrentBag.java

@@ -215,7 +215,7 @@ public class ConcurrentBag<T extends IConcurrentBagEntry> implements AutoCloseab
       sharedList.add(bagEntry);
 
       // spin until a thread takes it or none are waiting
-      while (waiters.get() > 0 && bagEntry.getState() != STATE_NOT_IN_USE && !handoffQueue.offer(bagEntry)) {
+      while (waiters.get() > 0 && bagEntry.getState() == STATE_NOT_IN_USE && !handoffQueue.offer(bagEntry)) {
          yield();
       }
    }