[PATCH 0/1] MR9180: win32u: Fix deadlock caused by nested locking.

[Zhao Yi (＠Zhaoyi)]

Within the NtUserUpdateLayeredWindow function, there exists the following call sequence:
window_surface_lock()->NtGdiAlphaBlend()->window_surface_unlock(). However, the implementation
of the NtGdiAlphaBlend() function calls the windrv_GetImage() function, which internally
invokes lock_surface() and unlock_surface(). In this situation, window_surface_lock() is called
first to acquire a lock. When lock_surface() is subsequently called to acquire the same lock,
the initial lock has not yet been released, ultimately resulting in a deadlock.

Signed-off-by: Zhao Yi