cd $oldpwd in enter-chroot is a host path, not a guest path

[andychu]

These lines don't seem to make sense:

		oldpwd="$(pwd)"
...

		$_sudo chroot . /usr/bin/env -i su -l "$user" \
		    sh -c ". /etc/profile; . /env.sh; cd '$oldpwd' 2>/dev/null; \"\$@\"" \
		    -- "${@:-sh}"

because

• $oldpwd is a host path
• after you chroot, you're in the guest
• then you cd into a host path in the guest, which likely does NOT exist

It is harmless, but it looks like dead code to me. And the error message is supressed with 2>/dev/null.

---

I have a few more fixes in the fork https://github.com/oils-for-unix/alpine-chroot-install if interested