Fix ASN1_TYPE_cmp

Fix segmentation violation when ASN1_TYPE_cmp is passed a boolean type. This
can be triggered during certificate verification so could be a DoS attack
against a client or a server enabling client authentication.

CVE-2015-0286

Reviewed-by: Richard Levitte <levitte@openssl.org>

crypto/asn1/a_type.c

@@ -115,6 +115,9 @@ int ASN1_TYPE_cmp(const ASN1_TYPE *a, const ASN1_TYPE *b)
    case V_ASN1_OBJECT:
        result = OBJ_cmp(a->value.object, b->value.object);
        break;
    case V_ASN1_BOOLEAN:
        result = a->value.boolean - b->value.boolean;
        break;
    case V_ASN1_NULL:
        result = 0;             /* They do not have content. */
        break;