drm/i915/dvo: Don't leak connector state on DVO init failure

If we can't initialize the DVO encoder also free the connector
state allocated by intel_connector_alloc().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221118105525.27254-3-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>