Use drm_connector_has_possible_encoder() for checking
whether the encoder has an associated connector.
v2: Replace the drm_for_each_connector_encoder_ids() loop
    with a simple drm_connector_has_possible_encoder() call
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180628131315.14156-9-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
        connector_list = &dev->mode_config.connector_list;
 
        list_for_each_entry(connector, connector_list, head) {
-               int i;
-
-               for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
-                       if (connector->encoder_ids[i] == encoder->base.id)
-                               return connector;
-               }
+               if (drm_connector_has_possible_encoder(connector, encoder))
+                       return connector;
        }
 
        return ERR_PTR(-ENODEV);