drm/i915: prevent possible pin leak on error path

commit ab3951eb74e7c33a2f5b7b64d72e82f1eea61571 upstream.

We should not hit this under any sane conditions, but still, this does not
looks right.

Reported-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
CC: Chris Wilson <chris@chris-wilson.co.uk>
CC: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Chris Wlison <chris@chris-wilson.co.uk>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>