Don't bother testing the reason for exiting the wait condition. If there is...

Don't bother testing the reason for exiting the wait condition. If there is nothing to do, it will exit any way.

src/QtLocationPlugin/QGCTileCacheWorker.cpp

@@ -188,18 +188,15 @@ QGCCacheWorker::run()
             //-- Wait a bit before shutting things down
             _waitmutex.lock();
             int timeout = 5000;
-            if(!_waitc.wait(&_waitmutex, timeout))
-            {
-                _waitmutex.unlock();
-                _mutex.lock();
-                //-- If nothing to do, close db and leave thread
-                if(!_taskQueue.count()) {
-                    _mutex.unlock();
-                    break;
-                }
+            _waitc.wait(&_waitmutex, timeout);
+            _waitmutex.unlock();
+            _mutex.lock();
+            //-- If nothing to do, close db and leave thread
+            if(!_taskQueue.count()) {
                 _mutex.unlock();
+                break;
             }
-            _waitmutex.unlock();
+            _mutex.unlock();
         }
     }
     if(_db) {