selftests/liveupdate: add test cases for LIVEUPDATE_IOCTL_CREATE_SESSION calls with...

selftests/liveupdate: add test cases for LIVEUPDATE_IOCTL_CREATE_SESSION calls with invalid length

Verify that LIVEUPDATE_IOCTL_CREATE_SESSION ioctl which provide a name
that is an empty string or too long are not allowed.

Cc: stable@vger.kernel.org
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Link: https://lore.kernel.org/r/20260429212221.814107-3-luca.boccassi@gmail.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>