disable write level event while waiting auth server response

src/imap/ngx_imap_auth_http_module.c

diff --git a/src/imap/ngx_imap_auth_http_module.c b/src/imap/ngx_imap_auth_http_module.c
index 8dbbb72..96531ab 100644
--- a/src/imap/ngx_imap_auth_http_module.c
+++ b/src/imap/ngx_imap_auth_http_module.c
@@ -250,6 +250,12 @@
                 ngx_del_timer(wev);
             }
 
+            if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
+                ngx_close_connection(ctx->peer.connection);
+                ngx_destroy_pool(ctx->pool);
+                ngx_imap_session_internal_server_error(s);
+            }
+
             return;
         }
     }