pgsql: Suppress gcc warning about possibly-uninitialized variable.

Log Message:
-----------
Suppress gcc warning about possibly-uninitialized variable. It's not
clear to me why I'd not seen this message before --- on F-9 it seems to
only happen if Asserts are disabled, which ought to be irrelevant.
Maybe that affects a decision whether to inline get_ten(), which would
be needed to expose the warning condition to the compiler? Anyway,
the fix is clear.

Modified Files:
--------------
pgsql/src/backend/utils/mb/conversion_procs/euc_jis_2004_and_shift_jis_2004:
euc_jis_2004_and_shift_jis_2004.c (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_jis_2004_and_shift_jis_2004/euc_jis_2004_and_shift_jis_2004.c?r1=1.3&r2=1.4)