[Intel-gfx] [PATCH] drivers/gpu/drm/i915/selftests/i915_buddy.c: Fix bug

[Chris Wilson]

Quoting George Spelvin (2020-03-25 19:24:29)
> igt_mm_config() calls ilog2() on the (pseudo)random 21-bit number
> s>>12.  Once in 2 million seeds, this is zero and ilog2 summons
> the nasal demons.

I ran into a similar bug with random returning 0 and remembered this
patch sitting around.

Pushed, and many thanks for the fix!
-Chris