itss: remove redundant NULL check before free (found by Smatch).

[Lionel_Debroux]

"chm_close" in dlls/itss/chm_lib.c gets flagged by Michael
Stefaniuc's redundant_null_check.pl script.

2007-10-20  Lionel Debroux <lionel_debroux at yahoo.fr>
        * dlls/itss/chm_lib.c:
        itss: remove redundant NULL check before free (found by Smatch).


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