small fix to possible null pointer dereference in byteaout() varlena.c

Greg Jaskiewicz <gryzman@gmail.com>

From: Grzegorz Jaśkiewicz <gryzman@gmail.com>
To: pgsql-hackers@postgresql.org
Date: 2010-09-28T13:31:48Z
Lists: pgsql-hackers

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It would crash if input is of unrecognized format. Probably than
there's going to be more problems to be concerned with, but just in
case, don't crash in

-- 
GJ