fix warn log condition

Author: gmtstephane

oapi_validate.go

@@ -79,7 +79,7 @@ type Options struct {
 
 // OapiRequestValidatorWithOptions creates a validator from a swagger object, with validation options
 func OapiRequestValidatorWithOptions(swagger *openapi3.T, options *Options) echo.MiddlewareFunc {
-	if swagger.Servers != nil && (options == nil || options.SilenceServersWarning) {
+	if swagger.Servers != nil && (options == nil || !options.SilenceServersWarning) {
 		log.Println("WARN: OapiRequestValidatorWithOptions called with an OpenAPI spec that has `Servers` set. This may lead to an HTTP 400 with `no matching operation was found` when sending a valid request, as the validator performs `Host` header validation. If you're expecting `Host` header validation, you can silence this warning by setting `Options.SilenceServersWarning = true`. See https://github.com/deepmap/oapi-codegen/issues/882 for more information.")
 	}