drm/ttm: cleanup ttm_eu_reserve_buffers handling
With the lru lock no longer required for protecting reservations we can just do a ttm_bo_reserve_nolru on -EBUSY, and handle all errors in a single path. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Reviewed-by: Jerome Glisse <jglisse@redhat.com>
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