server: remove redundant NULL checks before free (found by Smatch).

[Lionel_Debroux]

"key_destroy" in server/registry.c gets flagged by Michael Stefaniuc's
redundant_null_check.pl script.

2007-10-20  Lionel Debroux <lionel_debroux at yahoo.fr>
        * server/registry.c:
        server: remove redundant NULL checks before free (found by Smatch).


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