datatransfer: fix non-closed output file

At reception, output file was not closed due to silented exception
before the close() call.

Change-Id: I9f2bb2dd29db74391fb95acfa97863b4a118189f

src/data_transfer.cpp

@@ -284,10 +284,10 @@ IncomingFileTransfer::close() noexcept
 
     try {
         filenamePromise_.set_value();
-        fout_.close();
-        RING_DBG() << "[FTP] file closed with size " << info_.bytesProgress;
     } catch (...) {}
 
+    fout_.close();
+    RING_DBG() << "[FTP] file closed with size " << info_.bytesProgress;
 
     emit(DRing::DataTransferEventCode::finished);
 }