drm/i915/sdvo: Filter out invalid outputs more sensibly

drm/i915/sdvo: Filter out invalid outputs more sensibly

commit 35fcfcd9ba544476455224714c3385c8dc8cbae8 upstream.

We try to filter out the corresponding xxx1 output
if the xxx0 output is not present. But the way that is
being done is pretty awkward. Make it less so.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026101134.20865-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit cc1e66394daaa7e9f005e2487a84e34a39f9308b)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>