tests: Fix a valgrind warning.
tests: Fix a valgrind warning.

sebadoom/libssh,DouglasHeriot/libssh,Distrotech/libssh,nviennot/libssh,wangshawn/libssh,pouete/libssh,elastichosts/libssh,robxu9/libssh,taikoo/libssh,robxu9/libssh,taikoo/libssh,kedazo/libssh,mwgoldsmith/ssh,robxu9/libssh,wangshawn/libssh,kedazo/libssh,robxu9/libssh,nviennot/libssh,sebadoom/libssh,mwgoldsmith/libssh,elastichosts/libssh,Distrotech/libssh,Distrotech/libssh,DouglasHeriot/libssh,sebadoom/libssh,kedazo/libssh,sebadoom/libssh,nviennot/libssh,mwgoldsmith/libssh,pouete/libssh,Distrotech/libssh,elastichosts/libssh,wangshawn/libssh,taikoo/libssh,pouete/libssh,wangshawn/libssh,DouglasHeriot/libssh,nviennot/libssh,DouglasHeriot/libssh,mwgoldsmith/libssh,mwgoldsmith/libssh,pouete/libssh,kedazo/libssh,mwgoldsmith/ssh,taikoo/libssh,mwgoldsmith/ssh,mwgoldsmith/ssh