[file-roller] Fixed crashes when trying to create a tar.z7 archive

[Paolo Bacchilega <paobac src gnome org>]

commit e1fe661156920c96bae149689bf8415c1376b6a7
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 6 09:15:37 2010 +0200

    Fixed crashes when trying to create a tar.z7 archive
    
    due to a missing sentinel in a varargs call.
    
    [bug #617840]

 src/fr-command-tar.c |    2 +-
 src/fr-process.h     |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/fr-command-tar.c b/src/fr-command-tar.c
index 63626c9..2290a01 100644
--- a/src/fr-command-tar.c
+++ b/src/fr-command-tar.c
@@ -684,7 +684,7 @@ fr_command_tar_recompress (FrCommand *comm)
 		fr_process_add_arg (comm->process, "-l");
 
 		new_name = g_strconcat (c_tar->uncomp_filename, ".7z", NULL);
-		fr_process_add_arg_concat (comm->process, new_name);
+		fr_process_add_arg_concat (comm->process, new_name, NULL);
 
 		fr_process_add_arg (comm->process, c_tar->uncomp_filename);
 		fr_process_end_command (comm->process);
diff --git a/src/fr-process.h b/src/fr-process.h
index 24c0289..d519b03 100644
--- a/src/fr-process.h
+++ b/src/fr-process.h
@@ -97,7 +97,7 @@ void        fr_process_add_arg              (FrProcess    *fr_proc,
 					     const char   *arg);
 void        fr_process_add_arg_concat       (FrProcess    *fr_proc,
 					     const char   *arg,
-					     ...);
+					     ...) G_GNUC_NULL_TERMINATED;
 void        fr_process_add_arg_printf       (FrProcess    *fr_proc,
 					     const char   *format,
 					     ...) G_GNUC_PRINTF (2, 3);