Fix pool_extract_error_message not to write past end of message_buf. This causes kind = 0 error on some platforms/gcc combo. Patch contributed by Akio Ishida.  Minor tweak by Tatsuo.
Fix pool_extract_error_message not to write past end of message_buf.
This causes kind = 0 error on some platforms/gcc combo. Patch
contributed by Akio Ishida.  Minor tweak by Tatsuo.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres