drm/i915/selftests: Unwind hugepages to drop wakeref on error

drm/i915/selftests: Unwind hugepages to drop wakeref on error

[ Upstream commit 0ef54940993a31c2736e7095d6bee3db555e168b ]

Make sure that upon error after we have acquired the wakeref we do
release it again.

v2: add another missing "goto out_wf"(Andi).

Fixes: eec5ef53232a ("drm/i915/selftests: Grab the runtime pm in shrink_thp")
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Chris Wilson <chris.p.wilson@linux.intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230117123234.26487-1-nirmoy.das@intel.com
(cherry picked from commit 99a62ef2cd5ca7a2105531d50b45357482b08afc)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>