dzn: Fixes -Werror=incompatible-pointer-type
What does this MR do and why?
dzn: Fixes -Werror=incompatible-pointer-type
Error message:
../../src/microsoft/vulkan/dzn_device.c:3840:108: error: passing argument 5 of 'device->dev13->lpVtbl->OpenExistingHeapFromAddress1' from incompatible pointer type [-Werror=incompatible-pointer-types]