[libsoup] soup_form_decode_multipart: check that msg really is a non-NULL message

[Simon McVittie <smcv src gnome org>]

commit f4ca9a57535683db8c5d4599d53e5fb61fce806d
Author: Simon McVittie <simon mcvittie collabora co uk>
Date:   Wed Feb 8 10:05:02 2012 +0000

    soup_form_decode_multipart: check that msg really is a non-NULL message
    
    If it wasn't, the next line would segfault anyway.
    
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=669479
    Signed-off-by: Simon McVittie <simon mcvittie collabora co uk>
    Reviewed-by: Dan Winship <danw gnome org>

 libsoup/soup-form.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libsoup/soup-form.c b/libsoup/soup-form.c
index 4691c57..a781d3c 100644
--- a/libsoup/soup-form.c
+++ b/libsoup/soup-form.c
@@ -159,6 +159,8 @@ soup_form_decode_multipart (SoupMessage *msg, const char *file_control_name,
 	char *disposition, *name;
 	int i;
 
+	g_return_val_if_fail (SOUP_IS_MESSAGE (msg), NULL);
+
 	multipart = soup_multipart_new_from_message (msg->request_headers,
 						     msg->request_body);
 	if (!multipart)