gssapi: Fix a memory leak.
gssapi: Fix a memory leak.

CID #0

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