[grilo-plugins] youtube: Fix potential crasher

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 5ebf2ac1cbdfd261d9ad93193a4608c0d844d6b9
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jan 6 17:20:59 2014 +0100

    youtube: Fix potential crasher
    
    ytsrc might be uninitialised, so abort early in that case when called
    from read_url_async().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=721642

 src/youtube/grl-youtube.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/youtube/grl-youtube.c b/src/youtube/grl-youtube.c
index f0304f9..254d6a0 100644
--- a/src/youtube/grl-youtube.c
+++ b/src/youtube/grl-youtube.c
@@ -480,6 +480,8 @@ get_wc (void)
 {
   if (ytsrc && !ytsrc->priv->wc)
     ytsrc->priv->wc = grl_net_wc_new ();
+  else if (!ytsrc)
+    return NULL;
 
   return ytsrc->priv->wc;
 }
@@ -518,6 +520,11 @@ read_url_async (const gchar *url,
                 gpointer user_data)
 {
   AsyncReadCb *arc;
+  GrlNetWc *wc;
+
+  wc = get_wc ();
+  if (!wc)
+    return;
 
   arc = g_slice_new0 (AsyncReadCb);
   arc->url = g_strdup (url);
@@ -525,7 +532,7 @@ read_url_async (const gchar *url,
   arc->user_data = user_data;
 
   GRL_DEBUG ("Opening async '%s'", url);
-  grl_net_wc_request_async (get_wc (),
+  grl_net_wc_request_async (wc,
                         url,
                         cancellable,
                         read_done_cb,