openvpnserv: Clean up use of TEXT() from DNS patches

openvpnserv: Clean up use of TEXT() from DNS patches

These are slightly different and so not covered
by my automatic conversion script. Use __func__
to make the actual string slightly shorter.

Change-Id: If15862fe537496ac836fc443936ff8e7876a39c0
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250318173914.24425-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31161.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>