Removed the cloning of the final data in the attachment processor (#114)

* removed the cloning of the final data in the attachment processor

* fix linter

crypto/attachment.go

@@ -90,7 +90,9 @@ func (keyRing *KeyRing) newAttachmentProcessor(
 	go func() {
 		defer attachmentProc.done.Done()
 		ciphertext, _ := ioutil.ReadAll(reader)
-		message := NewPGPMessage(ciphertext)
+		message := &PGPMessage{
+			Data: ciphertext,
+		}
 		split, splitError := message.SeparateKeyAndData(estimatedSize, garbageCollector)
 		if attachmentProc.err != nil {
 			attachmentProc.err = splitError

crypto/keyring.go

@@ -130,7 +130,7 @@ func (keyRing *KeyRing) GetKeyIDs() []uint64 {
 // parts of these KeyRings.
 func FilterExpiredKeys(contactKeys []*KeyRing) (filteredKeys []*KeyRing, err error) {
 	now := time.Now()
-	hasExpiredEntity := false
+	hasExpiredEntity := false //nolint:ifshort
 	filteredKeys = make([]*KeyRing, 0)
 
 	for _, contactKeyRing := range contactKeys {