mbsinit: Don't crash for a NULL argument.

[pspp] / ChangeLog

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+2011-02-13  Bruno Haible  <bruno@clisp.org>
+
+       mbsinit: Don't crash for a NULL argument.
+       * lib/mbsinit.c (mbsinit): When the argument is NULL, return 1.
+       * tests/test-mbsinit.c (mbsinit): Check this behaviour.
+
 2011-02-13  Bruno Haible  <bruno@clisp.org>
 
        Don't interfere with a program's definition of __attribute__.