message: Fix crash when tgid info not found for i915 timeline
diff: @@ -2385,7 +2385,7 @@ uint32_t TraceWin::graph_render_i915_req_events( graph_info_t &gi )
  // Use commstr from i915_request_queue since it's from interrupt handler and
  // should have tid of user-space thread
  - label = tgid_info->commstr;
  + label = tgid_info ? tgid_info->commstr : event.user_comm;
  }
  if ( do_selrect || gi.is_i915_ringctxseq_selected( event ) )
  