pgsql: Fix bug in MIC -> EUC_JP conversion.

Log Message:
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Fix bug in MIC -> EUC_JP conversion. Per Atsushi Ogawa.

Tags:
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REL8_0_STABLE

Modified Files:
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pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis:
euc_jp_and_sjis.c (r1.9 -> r1.9.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c.diff?r1=1.9&r2=1.9.4.1)