Don't write out a bad OID
If we don't have OID data for an object then we should fail if we
are asked to encode the ASN.1 for that OID.
Fixes
@@ -528,6 +528,8 @@ static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
otmp = (ASN1_OBJECT *)*pval;
cont = otmp->data;
len = otmp->length;
+ if (cont == NULL || len == 0)
+ return -1;
break;
case V_ASN1_NULL:
