(krb5_to4): use krb5_cc_clear_mcred

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12424 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/login/login.c

@@ -205,6 +205,8 @@ krb5_to4 (krb5_ccache id)
 	krb5_error_code ret;
 	krb5_principal princ;
 
+	krb5_cc_clear_mcred(&mcred);
+
 	ret = krb5_cc_get_principal (context, id, &princ);
 	if (ret)
 	    return ret;