x11-utils: xprop -spy leaks memory

[DesDZ]

Dear developers,

There seems to be a memory leak in the xprop tool, when using the -spy
option. Pulseaudio uses that option to know when the X session ends, as
an example. On my (long-running) X session, xprop memory usage was
steadily growing until using 1.5G...

You'll find a patch as an attachment, it's not mine and I couldn't test
it, I found it at:
http://thread.gmane.org/gmane.linux.debian.devel.pulseaudio/4456

Here is the related Debian Bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765828

Thanks for your hard work...
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