Remove key_type argument from generate_key_random

Remove key_type argument from generate_key_random

This part of the function is not used by any part of
our source code. It looks also broken if called with kt!=NULL
The function cipher_kt_key_size expects its argument to be not
NULL and would break. So remove the unused code instead of fixing
it.

Found by Coverity.

Change-Id: Id56628cfb3dfd2f306bd9bdcca2e567ac0ca9ab2
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230601102506.4068185-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26737.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>