Fix synchronization bug in StorageFileLoader.cpp (wrong mutex)

UWP/StorageFileLoader.cpp

@@ -20,12 +20,13 @@ StorageFileLoader::StorageFileLoader(Windows::Storage::StorageFile ^file) {
 }
 
 StorageFileLoader::~StorageFileLoader() {
-	initMutex.lock();
-	active_ = false;
-	operationRequested_ = false;
-	cond_.notify_all();
+	{
+		std::unique_lock<std::mutex> lock(mutex_);
+		active_ = false;
+		operationRequested_ = false;
+		cond_.notify_all();
+	}
 	thread_->join();
-	initMutex.unlock();
 }
 
 void StorageFileLoader::threadfunc() {