Fixes #835 new change to reduce spinning on connection return

when the pool is saturated.

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

@@ -123,7 +123,6 @@ public class ConcurrentBag<T extends IConcurrentBagEntry> implements AutoCloseab
    public T borrow(long timeout, final TimeUnit timeUnit) throws InterruptedException
    {
       // Try the thread-local list first
-      if (waiters.get() == 0) {
       final List<Object> list = threadList.get();
       for (int i = list.size() - 1; i >= 0; i--) {
          final Object entry = list.remove(i);
@@ -133,7 +132,6 @@ public class ConcurrentBag<T extends IConcurrentBagEntry> implements AutoCloseab
             return bagEntry;
          }
       }
-      }
 
       // Otherwise, scan the shared list ... then poll the handoff queue
       final int waiting = waiters.incrementAndGet();
@@ -181,7 +179,7 @@ public class ConcurrentBag<T extends IConcurrentBagEntry> implements AutoCloseab
    {
       bagEntry.setState(STATE_NOT_IN_USE);
 
-      while (waiters.get() > 0) {
+      while (waiters.get() > 0 && bagEntry.getState() == STATE_NOT_IN_USE) {
          if (handoffQueue.offer(bagEntry)) {
             return;
          }