wsmand-listener: exit flow if gss_encrypt fail
wsmand-listener: exit flow if gss_encrypt fail

Exit flow if gss_encrypt fail, otherwise we'll use
potentially uninitialized variables.

Signed-off-by: Alexander Usyskin <2c2d03d7dae842f113743879f565d486184f22a3@intel.com>

kkaempf/openwsman,vcrhonek/openwsman,vcrhonek/openwsman,kkaempf/openwsman,Openwsman/openwsman,Openwsman/openwsman,Openwsman/openwsman,kkaempf/openwsman,Openwsman/openwsman,Openwsman/openwsman,vcrhonek/openwsman,vcrhonek/openwsman,vcrhonek/openwsman,vcrhonek/openwsman,kkaempf/openwsman,kkaempf/openwsman,kkaempf/openwsman,vcrhonek/openwsman,Openwsman/openwsman,Openwsman/openwsman,kkaempf/openwsman