client: Check return value of ssh_handle_packets_termination.
client: Check return value of ssh_handle_packets_termination.

Found by Coverity.

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