gssapi: Refactor ssh_gssapi_build_mic() to avoid memory leaks.
gssapi: Refactor ssh_gssapi_build_mic() to avoid memory leaks.

CID #0

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