The source project of this merge request has been removed.
asprintf() returns -1 on error
Fixes the bugs reported on the mailing list and Ubuntu tracker…
- http://lists.infradead.org/pipermail/openconnect-devel/2018-December/005164.html "Failed to obtain WebVPN cookie introduced by f08767d9"
- https://bugs.launchpad.net/bugs/1809839 "[Bug 1809839] [NEW] Daily build 2667 broken for protocol=GP"