Fix shadow compiler warning in sample code.
Fix shadow compiler warning in sample code.

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