[evolution-ews] EEwsConnection: Release queue lock as soon as possible in ews_next_request()

[Milan Crha <mcrha src gnome org>]

commit a80c55fee430452072540f06a1ae1271cd7a9650
Author: Milan Crha <mcrha redhat com>
Date:   Tue Aug 31 17:40:07 2021 +0200

    EEwsConnection: Release queue lock as soon as possible in ews_next_request()
    
    This could cause a deadlock when other thread cancels an ongoing
    request (the ews_next_request() thread inside the e_ews_connection_utils_prepare_message())
    and the ews_cancel_request() is called as the callback to the GCancellable::cancelled
    signal.

 src/EWS/common/e-ews-connection.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/src/EWS/common/e-ews-connection.c b/src/EWS/common/e-ews-connection.c
index 1ecacb19..0d7dcb25 100644
--- a/src/EWS/common/e-ews-connection.c
+++ b/src/EWS/common/e-ews-connection.c
@@ -711,22 +711,20 @@ ews_next_request (gpointer _cnc)
        /* Add to active job queue */
        cnc->priv->active_job_queue = g_slist_append (cnc->priv->active_job_queue, node);
 
+       QUEUE_UNLOCK (cnc);
+
        if (cnc->priv->soup_session) {
                SoupMessage *msg = SOUP_MESSAGE (node->msg);
 
                if (!e_ews_connection_utils_prepare_message (cnc, NULL, msg, node->cancellable)) {
                        e_ews_debug_dump_raw_soup_request (msg);
-                       QUEUE_UNLOCK (cnc);
 
                        ews_response_cb (cnc->priv->soup_session, msg, node);
                } else {
                        e_ews_debug_dump_raw_soup_request (msg);
                        soup_session_queue_message (cnc->priv->soup_session, msg, ews_response_cb, node);
-                       QUEUE_UNLOCK (cnc);
                }
        } else {
-               QUEUE_UNLOCK (cnc);
-
                ews_cancel_request (NULL, node);
        }