host/logbuf: Fix race on closed flag
host/logbuf: Fix race on closed flag

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

felixrieseberg/flynn,schatt/flynn,jzila/flynn,philiplb/flynn,benbjohnson/flynn,supermario/flynn,tonicbupt/flynn,philiplb/flynn,Brandywine2161/flynn,ozum/flynn,lmars/flynn,technosophos/flynn,arekkas/flynn,clifff/flynn,pkdevbox/flynn,TribeMedia/flynn,ozum/flynn,justintung/flynn,schatt/flynn,supermario/flynn,tonicbupt/flynn,philiplb/flynn,supermario/flynn,whouses/flynn,pkdevbox/flynn,shads196770/flynn,GrimDerp/flynn,GrimDerp/flynn,whouses/flynn,GrimDerp/flynn,schatt/flynn,rikur/flynn,Brandywine2161/flynn,Brandywine2161/flynn,GrimDerp/flynn,justintung/flynn,benbjohnson/flynn,justintung/flynn,philiplb/flynn,TribeMedia/flynn,kgrz/flynn,josephglanville/flynn,shads196770/flynn,GrimDerp/flynn,felixrieseberg/flynn,shads196770/flynn,tonicbupt/flynn,rikur/flynn,technosophos/flynn,shads196770/flynn,supermario/flynn,lmars/flynn,shads196770/flynn,clifff/flynn,justintung/flynn,TribeMedia/flynn,technosophos/flynn,kgrz/flynn,technosophos/flynn,kgrz/flynn,arekkas/flynn,rikur/flynn,lmars/flynn,rikur/flynn,jzila/flynn,tonicbupt/flynn,benbjohnson/flynn,whouses/flynn,justintung/flynn,philiplb/flynn,whouses/flynn,benbjohnson/flynn,flynn/flynn,jzila/flynn,pkdevbox/flynn,kgrz/flynn,flynn/flynn,pkdevbox/flynn,whouses/flynn,TribeMedia/flynn,jzila/flynn,clifff/flynn,mubassirhayat/flynn,benbjohnson/flynn,whouses/flynn,TribeMedia/flynn,kgrz/flynn,felixrieseberg/flynn,arekkas/flynn,ozum/flynn,justintung/flynn,tonicbupt/flynn,schatt/flynn,rikur/flynn,mubassirhayat/flynn,benbjohnson/flynn,GrimDerp/flynn,ozum/flynn,ozum/flynn,flynn/flynn,mubassirhayat/flynn,arekkas/flynn,lmars/flynn,rikur/flynn,Brandywine2161/flynn,Brandywine2161/flynn,jzila/flynn,schatt/flynn,clifff/flynn,clifff/flynn,felixrieseberg/flynn,TribeMedia/flynn,kgrz/flynn,josephglanville/flynn,arekkas/flynn,flynn/flynn,flynn/flynn,josephglanville/flynn,lmars/flynn,technosophos/flynn,pkdevbox/flynn,josephglanville/flynn,supermario/flynn,clifff/flynn,mubassirhayat/flynn,ozum/flynn,jzila/flynn,supermario/flynn,pkdevbox/flynn,shads196770/flynn,Brandywine2161/flynn,josephglanville/flynn,schatt/flynn,josephglanville/flynn,felixrieseberg/flynn