Fix cloudflare provider failing on cleanup if no record is found

It's possible for cert-manager to get in a bad state where it thinks there's something to cleanup, but repeatedly fails to clean it up.

Not finding the record should not be an error when we're trying to delete the record anyway.

Signed-off-by: Frank Hamand <frankhamand@gmail.com>

pkg/issuer/acme/dns/cloudflare/cloudflare.go

@@ -121,6 +121,10 @@ func (c *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 	}
 
 	record, err := c.findTxtRecord(fqdn)
+	// Nothing to cleanup
+	if err == errNoExistingRecord {
+		return nil
+	}
 	if err != nil {
 		return err
 	}