implement basic listing of attribute certificates

src/libstrongswan/plugins/x509/x509_ac.c

@@ -990,13 +990,8 @@ static private_x509_ac_t* build(private_builder_t *this)
 
 	free(this);
 
-	if (ac == NULL)
-	{
-		return NULL;
-	}
-
-	/* synthesis if TRUE or analysis if FALSE */
-	if (ac->encoding.ptr == NULL)
+	/* synthesis if encoding does not exist */
+	if (ac && ac->encoding.ptr == NULL)
 	{
 		if (ac->holderCert && ac->signerCert && ac->signerKey)
 		{
@@ -1008,7 +1003,7 @@ static private_x509_ac_t* build(private_builder_t *this)
 	}
 	else
 	{
-		return NULL;
+		return ac;
 	}
 }