xlogviewer - xlogdump: corrected the -? logic

Log Message:
-----------
corrected the -? logic

Modified Files:
--------------
xlogdump:
xlogdump (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/xlogviewer/xlogdump/xlogdump.diff?r1=1.13&r2=1.14)
xlogdump.c (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/xlogviewer/xlogdump/xlogdump.c.diff?r1=1.11&r2=1.12)