message: Fix i915 tracepoint crash when no tgid info found
diff: @@ -2228,7 +2228,7 @@ uint32_t TraceWin::graph_render_i915_reqwait_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;
  }
  imgui_push_cliprect( { x0, ty, x1 - x0, gi.text_h } );
  