Dave Airlie
ac391536eb
Otherwise we munmap(0, size) and remove the cts binary maps
Also add an assert, though NULL is legal for munmap in theory,
nothing should be using it in practice on Linux.
Fixes: e6f137e9ed ("nvk: Only map heaps that explicitly request maps")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28006>
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