try to return the error string from krb5

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9902 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/gssapi/krb5/display_name.c

@@ -52,6 +52,7 @@ OM_uint32 gss_display_name
 			    &buf);
   if (kret) {
     *minor_status = kret;
+    gssapi_krb5_set_error_string ();
     return GSS_S_FAILURE;
   }
   len = strlen (buf);