I think this was fixed in 0.33.6ubuntu2
human-icon-theme (0.33.6ubuntu2) jaunty; urgency=high
* Correcting error in .links file
* Fixing disconnected icon design and names per sabdfl request in order to
fix LP: #358526
* Replacing rounded wireless icons with bars to match the above change
Which ubuntu version? I cannot reproduce this in Ubuntu 9.04:
$ file /usr/share/icons/Human/scalable/actions/system-log-out.png
/usr/share/icons/Human/scalable/actions/system-log-out.png: ERROR: cannot open
`/usr/share/icons/Human/scalable/actions/system-log-out.png' (No such file or
directory)