drm/vmwgfx: Use kref in vmw_bo_dirty

Rather than using an ad hoc reference count use kref which is atomic
and has underflow warnings.

Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patch.msgid.link/20251030193640.153697-1-ian.forbes@broadcom.com
This commit is contained in:
Ian Forbes 2025-10-30 14:36:40 -05:00 • committed by Zack Rusin
commit c1962742ff