XCB-XVideo: fix shared-memory YUY2

modules/video_output/xcb/xvideo.c

@@ -612,7 +612,7 @@ static void Display (vout_display_t *vd, picture_t *pic)
                               vd->source.i_visible_width,
                               vd->source.i_visible_height,
                    /* Dst: */ 0, 0, p_sys->width, p_sys->height,
-                /* Memory: */ pic->p->i_pitch / pic->p->i_pixel_pitch,
+                /* Memory: */ vd->source.i_width,
                               pic->p->i_visible_lines, false);
     else
         ck = xcb_xv_put_image_checked (p_sys->conn, p_sys->port, p_sys->window,