[libgdata] core: Only propagate the first auth. error in the ClientLogin authorizer

[Philip Withnall <pwithnall src gnome org>]

commit 9e3042ef261a2972b2f882f9a71e5cf5a696f4fc
Author: Philip Withnall <philip tecnocode co uk>
Date:   Sat Aug 20 17:37:26 2011 +0100

    core: Only propagate the first auth. error in the ClientLogin authorizer

 gdata/gdata-client-login-authorizer.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/gdata/gdata-client-login-authorizer.c b/gdata/gdata-client-login-authorizer.c
index ce50522..7120b98 100644
--- a/gdata/gdata-client-login-authorizer.c
+++ b/gdata/gdata-client-login-authorizer.c
@@ -886,9 +886,13 @@ authenticate_thread (GSimpleAsyncResult *result, GDataClientLoginAuthorizer *aut
 
 		success = authenticate (authorizer, domain, data->username, data->password, NULL, NULL, cancellable, &authenticate_error) && success;
 
-		if (success == FALSE) {
+		/* Only propagate the first error which occurs. */
+		if (success == FALSE && error == NULL) {
 			g_propagate_error (&error, authenticate_error);
+			authenticate_error = NULL;
 		}
+
+		g_clear_error (&authenticate_error);
 	}
 
 	g_static_rec_mutex_unlock (&(priv->mutex));