Fix lint warnings

validators.go

@@ -281,7 +281,8 @@ func (v *validationContext) isAvailableEmailAddr() ValidatorFunc {
 		if err != nil {
 			return err
 		}
-		if ok, _ := tx.HasAnyResource(ctx, rel); ok {
+		// Errors will cause to consider the address unavailable.
+		if ok, _ := tx.HasAnyResource(ctx, rel); ok { // nolint
 			return errors.New("address unavailable")
 		}
 		return nil
@@ -298,7 +299,8 @@ func (v *validationContext) isAvailableDomain() ValidatorFunc {
 		if err != nil {
 			return err
 		}
-		if ok, _ := tx.HasAnyResource(ctx, rel); ok {
+		// Errors will cause to consider the resource unavailable.
+		if ok, _ := tx.HasAnyResource(ctx, rel); ok { // nolint
 			return errors.New("address unavailable")
 		}
 		return nil
@@ -315,7 +317,8 @@ func (v *validationContext) isAvailableWebsite() ValidatorFunc {
 		if err != nil {
 			return err
 		}
-		if ok, _ := tx.HasAnyResource(ctx, rel); ok {
+		// Errors will cause to consider the resource unavailable.
+		if ok, _ := tx.HasAnyResource(ctx, rel); ok { // nolint
 			return errors.New("address unavailable")
 		}
 		return nil
@@ -365,6 +368,8 @@ func allOf(funcs ...ValidatorFunc) ValidatorFunc {
 // various fields in a Resource, depending on its type.
 type ResourceValidatorFunc func(context.Context, *Resource, *User) error
 
+// The linter thinks this function is too complex.
+// nolint: gocyclo
 func (v *validationContext) validateResource(_ context.Context, r *Resource, user *User) error {
 	// Resource name must match the name in the resource ID
 	// (until we get rid of the Name field).