tightvnc-filetransfer: wait for download thread end in CloseUndoneFileDownload()

...and use it when deregistering the file transfer extension.

Closes #242

libvncserver/tightvnc-filetransfer/filetransfermsg.c

@@ -770,6 +770,8 @@ CloseUndoneFileDownload(rfbClientPtr cl, rfbTightClientPtr rtcp)
 	
 	if(rtcp->rcft.rcfd.downloadInProgress == TRUE) {
 		rtcp->rcft.rcfd.downloadInProgress = FALSE;
+		/* the thread will return if downloadInProgress is FALSE */
+		pthread_join(rtcp->rcft.rcfd.downloadThread, NULL);
 
 		if(rtcp->rcft.rcfd.downloadFD != -1) {			
 			close(rtcp->rcft.rcfd.downloadFD);

libvncserver/tightvnc-filetransfer/rfbtightserver.c

@@ -26,6 +26,7 @@
 #include <rfb/rfb.h>
 #include "rfbtightproto.h"
 #include "handlefiletransferrequest.h"
+#include "filetransfermsg.h"
 
 /*
  * Get my data!
@@ -448,9 +449,11 @@ rfbTightExtensionMsgHandler(struct _rfbClientRec* cl, void* data,
 void
 rfbTightExtensionClientClose(rfbClientPtr cl, void* data) {
 
-	if(data != NULL)
+	if(data != NULL) {
+		CloseUndoneFileUpload(cl, data);
+		CloseUndoneFileDownload(cl, data);
 		free(data);
-
+	}
 }
 
 void