drm/i915: Reclaim GTT space for failed PPGTT
When the PPGTT init fails, we may as well reuse the space that we were reserving for the PPGTT PDEs. This also fixes an extraneous mutex_unlock. Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: NJani Nikula <jani.nikula@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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