[poll] avoid infinite loop in ssh_poll_ctx_free() (cherry picked from commit eace59d3eaad413fd846d1c8b4c926285f6cd5ab)
[poll] avoid infinite loop in ssh_poll_ctx_free()
(cherry picked from commit eace59d3eaad413fd846d1c8b4c926285f6cd5ab)

rofl0r/libssh,mwgoldsmith/ssh,DouglasHeriot/libssh,robxu9/libssh,mwgoldsmith/ssh,taikoo/libssh,nviennot/libssh,pouete/libssh,mwgoldsmith/libssh,sebadoom/libssh,taikoo/libssh,elastichosts/libssh,mwgoldsmith/libssh,robxu9/libssh,taikoo/libssh,jt1/honeypot-libssh,kedazo/libssh,mwgoldsmith/ssh,wangshawn/libssh,elastichosts/libssh,kedazo/libssh,wangshawn/libssh,jt1/honeypot-libssh,rofl0r/libssh,Distrotech/libssh,kedazo/libssh,rofl0r/libssh,jt1/honeypot-libssh,rofl0r/libssh,sebadoom/libssh,robxu9/libssh,nviennot/libssh,DouglasHeriot/libssh,Distrotech/libssh,robxu9/libssh,taikoo/libssh,nviennot/libssh,DouglasHeriot/libssh,bigcat26/libssh-mod,jt1/honeypot-libssh,sebadoom/libssh,mwgoldsmith/ssh,kedazo/libssh,nviennot/libssh,pouete/libssh,mwgoldsmith/libssh,wangshawn/libssh,sebadoom/libssh,elastichosts/libssh,Distrotech/libssh,mwgoldsmith/libssh,bigcat26/libssh-mod,DouglasHeriot/libssh,pouete/libssh,bigcat26/libssh-mod,pouete/libssh,Distrotech/libssh,wangshawn/libssh,bigcat26/libssh-mod