dns providers: fix errors. (#642)

* fix: gloud errors.
* fix: azure errors.
* fix: iij errors.

providers/dns/azure/azure.go

@@ -127,8 +127,11 @@ func (d *DNSProvider) Present(domain, token, keyAuth string) error {
 	}
 
 	_, err = rsc.CreateOrUpdate(ctx, d.config.ResourceGroup, zone, relative, dns.TXT, rec, "", "")
+	if err != nil {
 		return fmt.Errorf("azure: %v", err)
 	}
+	return nil
+}
 
 // CleanUp removes the TXT record matching the specified parameters
 func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
@@ -150,8 +153,11 @@ func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 	rsc.Authorizer = autorest.NewBearerAuthorizer(spt)
 
 	_, err = rsc.Delete(ctx, d.config.ResourceGroup, zone, relative, dns.TXT, "")
+	if err != nil {
 		return fmt.Errorf("azure: %v", err)
 	}
+	return nil
+}
 
 // Checks that azure has a zone for this domain name.
 func (d *DNSProvider) getHostedZoneID(ctx context.Context, fqdn string) (string, error) {

providers/dns/gcloud/googlecloud.go

@@ -188,8 +188,11 @@ func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 	}
 
 	_, err = d.client.Changes.Create(d.config.Project, zone, &dns.Change{Deletions: records}).Do()
+	if err != nil {
 		return fmt.Errorf("googlecloud: %v", err)
 	}
+	return nil
+}
 
 // Timeout customizes the timeout values used by the ACME package for checking
 // DNS record validity.

providers/dns/iij/iij.go

@@ -76,16 +76,22 @@ func (d *DNSProvider) Present(domain, token, keyAuth string) error {
 	_, value, _ := acme.DNS01Record(domain, keyAuth)
 
 	err := d.addTxtRecord(domain, value)
+	if err != nil {
 		return fmt.Errorf("iij: %v", err)
 	}
+	return nil
+}
 
 // CleanUp removes the TXT record matching the specified parameters
 func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 	_, value, _ := acme.DNS01Record(domain, keyAuth)
 
 	err := d.deleteTxtRecord(domain, value)
+	if err != nil {
 		return fmt.Errorf("iij: %v", err)
 	}
+	return nil
+}
 
 func (d *DNSProvider) addTxtRecord(domain, value string) error {
 	zones, err := d.listZones()