Fix two bugs which affect delta CRL handling:

Use -1 to check all extensions in CRLs.
Always set flag for freshest CRL.

crypto/x509/x509_vfy.c

@@ -968,7 +968,7 @@ static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
 	{
 	ASN1_OCTET_STRING *exta, *extb;
 	int i;
-	i = X509_CRL_get_ext_by_NID(a, nid, 0);
+	i = X509_CRL_get_ext_by_NID(a, nid, -1);
 	if (i >= 0)
 		{
 		/* Can't have multiple occurrences */
@@ -979,7 +979,7 @@ static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
 	else
 		exta = NULL;
 
-	i = X509_CRL_get_ext_by_NID(b, nid, 0);
+	i = X509_CRL_get_ext_by_NID(b, nid, -1);
 
 	if (i >= 0)
 		{

crypto/x509v3/v3_purp.c

@@ -483,11 +483,11 @@ static void x509v3_cache_extensions(X509 *x)
 	for (i = 0; i < X509_get_ext_count(x); i++)
 		{
 		ex = X509_get_ext(x, i);
-		if (!X509_EXTENSION_get_critical(ex))
-			continue;
 		if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
 					== NID_freshest_crl)
 			x->ex_flags |= EXFLAG_FRESHEST;
+		if (!X509_EXTENSION_get_critical(ex))
+			continue;
 		if (!X509_supported_extension(ex))
 			{
 			x->ex_flags |= EXFLAG_CRITICAL;