[file-roller] fixed compiler warning

[Paolo Bacchilega <paobac src gnome org>]

commit bde30fc307eb0cda7ff996acc3d31da2a58c0d6a
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Mar 3 09:55:34 2019 +0100

    fixed compiler warning

 src/fr-command.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/fr-command.c b/src/fr-command.c
index 6a616575..fa1c46a7 100644
--- a/src/fr-command.c
+++ b/src/fr-command.c
@@ -1389,7 +1389,7 @@ copy_remote_files (FrCommand           *self,
        g_hash_table_destroy (created_folders);
 
        xfer_data = g_new0 (XferData, 1);
-       xfer_data->archive = g_object_ref (self);
+       xfer_data->archive = g_object_ref (FR_ARCHIVE (self));
        xfer_data->file_list = _g_object_list_ref (file_list);
        xfer_data->base_dir = g_object_ref (base_dir);
        xfer_data->dest_dir = g_strdup (dest_dir);