[libgdata] core: Drop an unused variable

[Philip Withnall <pwithnall src gnome org>]

commit d83e899da86565ce397c96f4b3e54e6b2f714ccf
Author: Philip Withnall <philip tecnocode co uk>
Date:   Tue Aug 22 22:51:25 2017 +0100

    core: Drop an unused variable
    
    Signed-off-by: Philip Withnall <philip tecnocode co uk>

 gdata/gdata-oauth1-authorizer.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gdata/gdata-oauth1-authorizer.c b/gdata/gdata-oauth1-authorizer.c
index 8163408..46c5837 100644
--- a/gdata/gdata-oauth1-authorizer.c
+++ b/gdata/gdata-oauth1-authorizer.c
@@ -889,7 +889,6 @@ request_authentication_uri_thread (GTask *task, gpointer source_object, gpointer
        GDataOAuth1Authorizer *authorizer = GDATA_OAUTH1_AUTHORIZER (source_object);
        g_autoptr(RequestAuthenticationUriAsyncData) data = NULL;
        g_autoptr(GError) error = NULL;
-       g_autofree gchar *authentication_uri = NULL;
 
        data = g_slice_new0 (RequestAuthenticationUriAsyncData);
        data->authentication_uri = gdata_oauth1_authorizer_request_authentication_uri (authorizer, 
&(data->token), &(data->token_secret),