ublk: check recovery flags for validity

ublk: check recovery flags for validity

Setting UBLK_F_USER_RECOVERY_REISSUE without also setting
UBLK_F_USER_RECOVERY is currently silently equivalent to not setting any
recovery flags at all, even though that's obviously not intended. Check
for this case and fail add_dev (with a paranoid warning to aid debugging
any program which might rely on the old behavior) with EINVAL if it is
detected.

Signed-off-by: Uday Shankar <ushankar@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241007182419.3263186-2-ushankar@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>