Log Message:-----------fix mmap bug
Modified Files:-------------- src/externaltable/exttab: FileBuffer.cc (r1.3 -> r1.4) (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/FileBuffer.cc?r1=1.3&r2=1.4)