hle: nvflinger: buffer_queue_core: Declare default dtor.

src/core/hle/service/nvflinger/buffer_queue_core.cpp

@@ -16,6 +16,8 @@ BufferQueueCore::BufferQueueCore() : lock{mutex, std::defer_lock} {
     }
 }
 
+BufferQueueCore::~BufferQueueCore() = default;
+
 void BufferQueueCore::NotifyShutdown() {
     std::unique_lock lk(mutex);
 

src/core/hle/service/nvflinger/buffer_queue_core.h

@@ -32,6 +32,7 @@ public:
     static constexpr s32 INVALID_BUFFER_SLOT = BufferItem::INVALID_BUFFER_SLOT;
 
     BufferQueueCore();
+    ~BufferQueueCore();
 
     void NotifyShutdown();