[file-roller] Fix crash when compressing remote files

[Paolo Bacchilega <paobac src gnome org>]

commit fb46c103054ff1bc79c83008d7b97602cffae154
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jun 13 13:34:11 2016 +0200

    Fix crash when compressing remote files
    
    Though the crash could possibly happen with any operation. Use the
    correct destructor for ->tmp_file, _g_object_unref() rather than
    g_free().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767577

 src/fr-command.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/fr-command.c b/src/fr-command.c
index 8eb947f..6a61657 100644
--- a/src/fr-command.c
+++ b/src/fr-command.c
@@ -79,7 +79,7 @@ xfer_data_free (XferData *data)
        _g_object_list_unref (data->file_list);
        _g_object_unref (data->base_dir);
        g_free (data->dest_dir);
-       g_free (data->tmp_dir);
+       _g_object_unref (data->tmp_dir);
        _g_object_unref (data->cancellable);
        _g_object_unref (data->result);
        g_free (data);