fileappender.cxx: Reverse the order of pubsetbuf() and open() calls to fix buffering issues in bug #3520891.
fileappender.cxx: Reverse the order of pubsetbuf() and open() calls to fix buffering issues in bug #3520891.

Reported by: sas-sf at users dot sourceforge dot com

csuideal/log4cplus,hunter-packages/log4cplus,ccpaging/log4cplus,ccpaging/log4cplus,hunter-packages/log4cplus,csuideal/log4cplus,ccpaging/log4cplus,csuideal/log4cplus,ccpaging/log4cplus,hunter-packages/log4cplus,hunter-packages/log4cplus,csuideal/log4cplus