[frogr] Added missing null-check checking the Soup response

[Mario Sanchez Prada <msanchez src gnome org>]

commit d9b87697c6acdf22131abe42a87ecb78978b7ddb
Author: Mario Sanchez Prada <msanchez igalia com>
Date:   Tue May 22 01:17:48 2012 +0200

    Added missing null-check checking the Soup response

 src/flicksoup/fsp-session.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/flicksoup/fsp-session.c b/src/flicksoup/fsp-session.c
index f98e69c..6f4a5b9 100644
--- a/src/flicksoup/fsp-session.c
+++ b/src/flicksoup/fsp-session.c
@@ -982,7 +982,7 @@ _check_errors_on_soup_response           (SoupMessage  *msg,
 
   /* First check it's not an OAuth problem */
   response_str = g_strndup (msg->response_body->data, msg->response_body->length);
-  if (g_str_has_prefix (response_str, "oauth_problem="))
+  if (response_str && g_str_has_prefix (response_str, "oauth_problem="))
     {
       if (!g_strcmp0 (&response_str[14], "token_rejected"))
         err = g_error_new (FSP_ERROR, FSP_ERROR_OAUTH_NOT_AUTHORIZED_YET,