Add noop do-while to non-DEBUG DXG_TRACE to avoid future compiler warnings

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**Is your feature request related to a problem? Please describe.**

As future Linux enables more warning flags[^1], some code needs to be changed accordingly to suppress warnings and support `WERROR=y` builds. One problem is the `DXG_TRACE` in drivers/hv/dxgkrnl:

https://github.com/microsoft/WSL2-Linux-Kernel/blob/427645e3db3a8896714f22a3d3fe0c3f7b317ad4/drivers/hv/dxgkrnl/dxgkrnl.h#L1031

Uses like the following generates a `if` statement without a body, which could trigger `-Wempty-body` warnings:

https://github.com/microsoft/WSL2-Linux-Kernel/blob/427645e3db3a8896714f22a3d3fe0c3f7b317ad4/drivers/hv/dxgkrnl/dxgmodule.c#L597-L599

I encountered this problem in a 3rdparty port (Nevuly/WSL2-Linux-Kernel-Rolling) targeting stable kernel branch. I think upstreaming the patch here would be more beneficial to every user.

**Describe the solution you'd like**

Adopt the patch as in [^2], thus eliminating this compiler warning from happening in the future.

**Describe alternatives you've considered**

* **Disable warnings.** Not ideal as this may hinder real positives, and implementing the patch has virtually no runtime impact.

**Additional context**

See also Nevuly/WSL2-Rolling-Kernel-Issue#37.

[^1]:
[^2]: Attachment: [0001-drivers-hv-dxgkrnl-Add-noop-do-while-to-non-DEBUG-DX.patch](https://github.com/user-attachments/files/22871168/0001-drivers-hv-dxgkrnl-Add-noop-do-while-to-non-DEBUG-DX.patch)

Start in drivers/hv/dxgkrnl/dxgkrnl.h at the non-DEBUG DXG_TRACE definition, then inspect the referenced use in drivers/hv/dxgkrnl/dxgmodule.c. Compare the attached patch and verify that the non-DEBUG macro no longer produces an empty if body. Build the affected kernel configuration with WERROR=y to confirm the warning is avoided.

Written by the indexing model from the issue text.