[msitools] Fix a gcc warning

[Marc-Andre Lureau <malureau src gnome org>]

commit 8ed8317b944df2d29edf035b6bf2256a6b4782c3
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Thu Feb 7 00:00:15 2013 +0100

    Fix a gcc warning
    
    libmsi-istream.c: In function 'libmsi_seekable_iface_init':
    libmsi-istream.c:68:17: error: assignment from incompatible pointer type [-Werror]

 libmsi/libmsi-istream.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libmsi/libmsi-istream.c b/libmsi/libmsi-istream.c
index 85653e5..e74e8fb 100644
--- a/libmsi/libmsi-istream.c
+++ b/libmsi/libmsi-istream.c
@@ -47,7 +47,7 @@ libmsi_can_seek (GSeekable *seekable)
 
 static gboolean
 libmsi_seek (GSeekable *seekable, goffset offset,
-             GSeekType type, GCancellable *cancellable)
+             GSeekType type, GCancellable *cancellable, GError **error)
 {
     g_return_val_if_fail (LIBMSI_IS_ISTREAM(seekable), FALSE);