[parrot/parrot] a39ea7: Fix `make headerizer` warning: "Returns a pointer, ...

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

Commit: a39ea75294fc901cebac31504cb0dba8176941e4
    https://github.com/parrot/parrot/commit/a39ea75294fc901cebac31504cb0dba8176941e4
Author: Bruce Gray <bruce.gray at acm.org>
Date:   2011-02-27 (Sun, 27 Feb 2011)

Changed paths:
  M src/pmc.c

Log Message:
-----------
Fix `make headerizer` warning: "Returns a pointer, but no PARROT_CAN(NOT)_RETURN_NULL macro found"