Pre-NV50 chipsets don't currently use the MMU subsystem that later
chipsets use, and type_vram is negative here, leading to an OOB memory
access.
This was previously guarded by a chipset check, restore that.
Reported-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes:
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| .. | ||
| drm | ||
| host1x | ||
| ipu-v3 | ||
| trace | ||
| vga | ||
| Makefile | ||