SVC: Correct ArbitrateUnlock

src/core/hle/kernel/mutex.h

@@ -28,6 +28,9 @@ public:
     ResultCode TryAcquire(VAddr address, Handle holding_thread_handle,
                           Handle requesting_thread_handle);
 
+    /// Unlocks a mutex for owner at address
+    std::pair<ResultCode, std::shared_ptr<Thread>> Unlock(std::shared_ptr<Thread> owner, VAddr address);
+
     /// Releases the mutex at the specified address.
     ResultCode Release(VAddr address);