Log when writing username/password to TLS buffer fails

Log when writing username/password to TLS buffer fails

Currently we get an unhelpful "Key Method #2 failed" error.
Add a more specific warning message.

Change-Id: I9468811fd434e17645957fc12770aa2b9ed98fb8
Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1600
Message-Id: <20260414055721.16857-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg36604.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit fd1fd077ea7781be8be6e05f2a2b657619c7e437)