[gnome-online-accounts] ewsclient: Add a comment to cover cancellation through a GCancellable

[Debarshi Ray <debarshir src gnome org>]

commit b3a6448cb5f31fec81cf8aaf480413327e6c7e73
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Dec 5 19:17:50 2018 +0100

    ewsclient: Add a comment to cover cancellation through a GCancellable

 src/goabackend/goaewsclient.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/goabackend/goaewsclient.c b/src/goabackend/goaewsclient.c
index bdc658e1..fc56bf7a 100644
--- a/src/goabackend/goaewsclient.c
+++ b/src/goabackend/goaewsclient.c
@@ -220,7 +220,11 @@ ews_client_autodiscover_response_cb (SoupSession *session, SoupMessage *msg, gpo
    */
   if (status == SOUP_STATUS_CANCELLED)
     {
-      /* If a previous autodiscover attempt for the same GAsyncResult
+      /* If we are being aborted by the GCancellable, then the
+       * GSimpleAsyncResult is responsible for setting the GError
+       * automatically.
+       *
+       * If a previous autodiscover attempt for the same GAsyncResult
        * was successful then no additional attempts are required and
        * we should use the result from the earlier attempt.
        */