prognam: Add diagnostic.

[pspp] / ChangeLog

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+2009-12-06  Bruno Haible  <bruno@clisp.org>
+
+       * lib/progname.c: Include stdio.h, stdlib.h.
+       (set_program_name): Reject a NULL argument.
+
 2009-12-05  Eric Blake  <ebb9@byu.net>
 
        pipe2-safer: new module