drm/i915: Do not return unknown status when load detection is tested.

This fixes the IGT test, which interprets unknown status as failed to
acquire load detect pipe.

Cc: Gabriel Feceoru <gabriel.feceoru@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456848241-6431-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/intel_crt.c

@@ -656,6 +656,8 @@ intel_crt_detect(struct drm_connector *connector, bool force)
 		else if (INTEL_INFO(dev)->gen < 4)
 			status = intel_crt_load_detect(crt,
 				to_intel_crtc(connector->state->crtc)->pipe);
+		else if (i915.load_detect_test)
+			status = connector_status_disconnected;
 		else
 			status = connector_status_unknown;
 		intel_release_load_detect_pipe(connector, &tmp, &ctx);