memmem: slight optimization

[pspp] / ChangeLog

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+2010-06-22  Eric Blake  <eblake@redhat.com>
+
+       memmem: slight optimization
+       * lib/str-two-way.h (critical_factorization): Update comments.
+       Reduce work during factorization phase.
+       Reported by Carlos Bueno <carlos@bueno.org>.
+
 2010-06-21  Bruno Haible  <bruno@clisp.org>
 
        Fix HAVE_CALLOC_POSIX misnomer.