[empathy/next] chatroom-manager: fix text channel check

[Guillaume Desmottes <gdesmott src gnome org>]

commit 8f0e2aea3ccb9887450e4ebd7580d4f222d3c791
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Feb 21 16:26:54 2014 +0100

    chatroom-manager: fix text channel check

 libempathy/empathy-chatroom-manager.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libempathy/empathy-chatroom-manager.c b/libempathy/empathy-chatroom-manager.c
index 41a8da5..5df9600 100644
--- a/libempathy/empathy-chatroom-manager.c
+++ b/libempathy/empathy-chatroom-manager.c
@@ -873,13 +873,14 @@ observe_channel_cb (TpSimpleObserver *observer,
   const gchar *roomname;
   EmpathyChatroom *chatroom;
 
-  if (tp_proxy_get_invalidated (channel) == NULL ||
+  if (tp_proxy_get_invalidated (channel) != NULL ||
       !EMPATHY_IS_TP_CHAT (channel))
     {
       GError e = { TP_ERROR, TP_ERROR_INVALID_ARGUMENT,
           "Not a text channel" };
 
       tp_observe_channel_context_fail (context, &e);
+      return;
     }
 
   tp_chat = EMPATHY_TP_CHAT (channel);