drm: Remove now pointelss blob->data casts

Now that blob->data is void* again we don't need the casts anymore.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180223192506.29992-2-ville.syrjala@linux.intel.com
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_edid.c

@@ -1554,8 +1554,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
 	struct edid *override = NULL;
 
 	if (connector->override_edid)
-		override = drm_edid_duplicate((const struct edid *)
-					      connector->edid_blob_ptr->data);
+		override = drm_edid_duplicate(connector->edid_blob_ptr->data);
 
 	if (!override)
 		override = drm_load_edid_firmware(connector);