rvCC->arena = arena;
NSSTrustDomain_CreateCryptoContext(  NSSTrustDomain *td,  NSSCallback *uhhOpt){    NSSArena *arena;    NSSCryptoContext *rvCC;    arena = NSSArena_Create();    if (!arena) {	return NULL;    }    rvCC = nss_ZNEW(arena, NSSCryptoContext);    if (!rvCC) {	return NULL;    }    rvCC->td = td;    return rvCC;}