auth: Fix a segfault in ssh_userauth_kbdint_init().
auth: Fix a segfault in ssh_userauth_kbdint_init().

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