[parrot/parrot] ada2ff: Update annotations for string functions that retur...

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Branch: refs/heads/master
Home:   https://github.com/parrot/parrot

Commit: ada2fffaf5b7c06292ca5bd75e055fe69d56f35c
    https://github.com/parrot/parrot/commit/ada2fffaf5b7c06292ca5bd75e055fe69d56f35c
Author: Andy Lester <andy at petdance.com>
Date:   2011-04-25 (Mon, 25 Apr 2011)

Changed paths:
  M include/parrot/string_funcs.h
  M src/string/api.c

Log Message:
-----------
Update annotations for string functions that return STRINGNULL.  They are now all PARROT_CANNOT_RETURN_NULL.