canonicalize: reduce memory usage

[pspp] / ChangeLog

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+2009-12-19  Eric Blake  <ebb9@byu.net>
+
+       canonicalize: reduce memory usage
+       * lib/canonicalize.c (canonicalize_filename_mode): Trim the
+       allocation to size.
+       Reported by Solar Designer <solar@openwall.com>.
+
 2009-12-19  Bruno Haible  <bruno@clisp.org>
 
        New module attribute 'Applicability'.