A potential NPD bug in src/XExtInt.c

Hi, I found a potential null pointer dereference bug in the project source code of libXi, and I have shown the execution sequence of the program that may generate the bug on the graph below. would you help to check if this bug is true?thank you.

The red text illustrates the steps that generate the bug

the red arrows represent the call relationships

the file path can be seen in the blue framed section.

although source code in graph is not latest version,but such case is still exist in latest version.( https://gitlab.freedesktop.org/xorg/lib/libxi/-/blob/master/src/XExtInt.c#L233)

I am looking forward to your reply and thank you for your patience and effort!