[vinagre] Make sure vinagre_connection_split_string() returns protocol as NULL if failed.

[Jonh Wendell <jwendell src gnome org>]

commit 32b327b3beb7420d3199b7a845b19ce1f557a6bd
Author: Jonh Wendell <jwendell gnome org>
Date:   Fri Jul 24 09:35:38 2009 -0300

    Make sure vinagre_connection_split_string() returns protocol as NULL if failed.
    
    Also, use the new function to get a plugin given a protocol, instead of
    use g_hash_table_lookup() directly.

 vinagre/vinagre-connection.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/vinagre/vinagre-connection.c b/vinagre/vinagre-connection.c
index 1daa392..769a3c4 100644
--- a/vinagre/vinagre-connection.c
+++ b/vinagre/vinagre-connection.c
@@ -532,12 +532,13 @@ vinagre_connection_split_string (const gchar *uri,
       lhost = (gchar *) uri;
     }
 
-  plugin = g_hash_table_lookup (vinagre_plugin_engine_get_plugins_by_protocol (vinagre_plugins_engine_get_default ()),
-				*protocol);
+  plugin = vinagre_plugins_engine_get_plugin_by_protocol (vinagre_plugins_engine_get_default (),
+							  *protocol);
   if (!plugin)
     {
       *error_msg = g_strdup_printf (_("The protocol %s is not supported."), *protocol);
       g_free (*protocol);
+      *protocol = NULL;
       g_strfreev (url);
       return FALSE;
     }