openssl/oct: improve bound check for len (#162) #178

Job	Run time
linux (gcc, fedora:latest, true)	1m 0s
osx (gcc)	51s
linux (gcc, quay.io/centos/centos:stream9, true)	1m 30s
osx (clang)	58s
linux (gcc, quay.io/centos/centos:stream8, true)	1m 56s
linux (gcc, debian:testing, true)	3m 7s
linux (gcc, debian:latest, true)	2m 57s
linux (gcc, ubuntu:rolling, true)	3m 54s
linux (gcc, ubuntu:jammy, true)	2m 12s
linux (gcc, ubuntu:focal, true)	1m 58s
linux (clang, fedora:latest, true)	1m 0s
linux (clang, quay.io/centos/centos:stream9, true)	2m 3s
linux (clang, quay.io/centos/centos:stream8, true)	2m 14s
linux (clang, debian:testing, true)	3m 15s
linux (clang, debian:latest, true)	3m 6s
linux (clang, ubuntu:rolling, true)	3m 23s
linux (clang, ubuntu:jammy, true)	2m 11s
linux (clang, ubuntu:focal, true)	2m 12s
linux (gcc, quay.io/fedora/fedora:rawhide, false)	52s
linux (clang, quay.io/fedora/fedora:rawhide, false)	1m 0s
linux (gcc, ubuntu:devel, false)	3m 40s
linux (clang, ubuntu:devel, false)	3m 20s
	48m 39s

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