Improve sftp_read().
Improve sftp_read().


git-svn-id: b1dee0d48e635e16c3b356ce77271b225d4db9f7@601 7dcaeef0-15fb-0310-b436-a5af3365683c

Distrotech/libssh,nviennot/libssh,miloj/libssh-v0.5,Distrotech/libssh,sebadoom/libssh,robxu9/libssh,substack/libssh,kedazo/libssh,kedazo/libssh,robxu9/libssh,elastichosts/libssh,jahrome/libssh,rofl0r/libssh,mwgoldsmith/libssh,substack/libssh,taikoo/libssh,nviennot/libssh,mwgoldsmith/ssh,pouete/libssh,mwgoldsmith/ssh,jt1/honeypot-libssh,mwgoldsmith/libssh,wangshawn/libssh,pouete/libssh,jt1/honeypot-libssh,rofl0r/libssh,kedazo/libssh,jahrome/libssh,elastichosts/libssh,jt1/honeypot-libssh,taikoo/libssh,mwgoldsmith/libssh,substack/libssh,pouete/libssh,mwgoldsmith/libssh,robxu9/libssh,miloj/libssh-v0.5,Distrotech/libssh,mwgoldsmith/ssh,jahrome/libssh,taikoo/libssh,taikoo/libssh,mwgoldsmith/ssh,elastichosts/libssh,sebadoom/libssh,robxu9/libssh,sebadoom/libssh,jt1/honeypot-libssh,kedazo/libssh,rofl0r/libssh,DouglasHeriot/libssh,wangshawn/libssh,bigcat26/libssh-mod,miloj/libssh-v0.5,wangshawn/libssh,nviennot/libssh,DouglasHeriot/libssh,nviennot/libssh,Distrotech/libssh,DouglasHeriot/libssh,bigcat26/libssh-mod,wangshawn/libssh,bigcat26/libssh-mod,rofl0r/libssh,sebadoom/libssh,DouglasHeriot/libssh,jahrome/libssh,bigcat26/libssh-mod,substack/libssh,miloj/libssh-v0.5,pouete/libssh