[PATCH] Fix multiple free property data

[Pierre Willenbrock]

Hi list,

this fixes a problem where data of window properties is freed without
the reference being replaced, leading to multiple frees and makes bad
things happen when the memory is reused(crashes).

This happens very seldom, since most of the time there is no data
attached to the property or it is replaced. It takes quite some time to
trigger when editing in emacs using the gtk gui. To my knowledge, no
other program had this problem.

Regards,
  Pierre
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