Meaningful exit codes from vncviewer

If there is no VNC server running on localhost and I still try to connect, I get the following output:

$ xtigervncviewer -AlertOnFatalError=0 localhost

TigerVNC Viewer 64-bit v1.9.0
Built on: 2020-01-23 18:03
Copyright (C) 1999-2018 TigerVNC Team and many others (see README.rst)
See http://www.tigervnc.org for information on TigerVNC.

Fri May  1 15:55:44 2020
 DecodeManager: Detected 4 CPU core(s)
 DecodeManager: Creating 4 decoder thread(s)
 CConn:       unable to create socket: Address family not supported by protocol
              (97)
$ echo $?
0

I would have expected a non-zero exit code.

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