better cleanup after unsuccesful transfers

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java

@@ -726,6 +726,9 @@ public class JingleConnection implements Downloadable {
 		this.mJingleConnectionManager.finishConnection(this);
 		if (this.responder.equals(account.getJid())) {
 			this.message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_FAILED));
+			if (this.file!=null) {
+				file.delete();
+			}
 			this.mXmppConnectionService.updateConversationUi();
 		} else {
 			this.mXmppConnectionService.markMessage(this.message,
@@ -743,6 +746,9 @@ public class JingleConnection implements Downloadable {
 		if (this.message != null) {
 			if (this.responder.equals(account.getJid())) {
 				this.message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_FAILED));
+				if (this.file!=null) {
+					file.delete();
+				}
 				this.mXmppConnectionService.updateConversationUi();
 			} else {
 				this.mXmppConnectionService.markMessage(this.message,

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleInbandTransport.java

@@ -34,7 +34,7 @@ public class JingleInbandTransport extends JingleTransport {
 	private JingleConnection connection;
 
 	private InputStream fileInputStream = null;
-	private OutputStream fileOutputStream;
+	private OutputStream fileOutputStream = null;
 	private long remainingSize = 0;
 	private long fileSize = 0;
 	private MessageDigest digest;
@@ -129,6 +129,20 @@ public class JingleInbandTransport extends JingleTransport {
 	@Override
 	public void disconnect() {
 		this.connected = false;
+		if (this.fileOutputStream != null) {
+			try {
+				this.fileOutputStream.close();
+			} catch (IOException e) {
+
+			}
+		}
+		if (this.fileInputStream != null) {
+			try {
+				this.fileInputStream.close();
+			} catch (IOException e) {
+
+			}
+		}
 	}
 
 	private void sendNextBlock() {

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleSocks5Transport.java

@@ -197,6 +197,20 @@ public class JingleSocks5Transport extends JingleTransport {
 	}
 
 	public void disconnect() {
+		if (this.outputStream != null) {
+			try {
+				this.outputStream.close();
+			} catch (IOException e) {
+
+			}
+		}
+		if (this.inputStream != null) {
+			try {
+				this.inputStream.close();
+			} catch (IOException e) {
+
+			}
+		}
 		if (this.socket != null) {
 			try {
 				this.socket.close();