2 bugs in stenc to enable HW encryption on LTO drives

The current version of stenc in Debian/Ubuntu still contains 2 small bugs which may cause the following error when trying to activate HW encryption:

$ stenc -f /dev/nst0 -a 1 -e on -k test.key
Provided key length is 256 bits.
Key checksum is 7a43.
Turning on encryption on device '/dev/nst0'...
Sense Code: Illegal Request (0x05)
 ASC: 0x26
 ASCQ: 0x00
 Additional data: 0x00000000000000000000000000000000
Error: Turning encryption on for '/dev/nst0' failed!
Usage: stenc --version | -g <length> -k <file> [-kd <description>] | -f <device> [--detail] [-e <on/mixed/rawread/off> [-k <file>] [-kd <description>] [-a <index>] [--protect | --unprotect] [--ckod] ]
Type 'man stenc' for more information

Please see also https://serverfault.com/questions/864580/what-could-cause-a-sense-error-when-setting-lto-encryption

Fixes have been applied to the GitHub repository of stenc (https://github.com/scsitape/stenc), but not ported to Debian. Fixing this would be very easy and be very helpful to users of stenc.