pki: fix gcrypt signature process
pki: fix gcrypt signature process

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