drm/ttm: Fix memory type manager debug information printing
System memory type doesn't have a drm_mm manager associated to it. This patch avoid trying to call drm_mm_debug on unitialized drm_mm when printing debug info on the system memory manager. Signed-off-by: Jerome Glisse <jglisse@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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