Fix hang when completing a file transfer over XMPP

Review Request #1466 — Created May 21, 2022 and submitted — Latest diff uploaded

Information

pidgin/pidgin
release-2.x.y

Reviewers

The way purple_xfer_drain_socket was implemented,
if the peer never close()d the connection, we would
wait forever for it to be closed remotely, causing
Pidgin to hang.

Tested IRC and XMPP on Windows and Linux. Transferred big and small files.

Commits

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