reexec: support systemd-boot initrd paths

(( ${#kernels[@]} > 0 )) || { echo "No kernel found." >&2; exit 2; }

select kernel in "${kernels[@]}"; do

	if [[ -e /boot/initramfs-${kernel#*-}.img ]]; then

	if [[ -e "${kernel%/linux*}/initrd" ]]; then

		initrd="--initrd=${kernel%/linux*}/initrd"

	elif [[ -e "${kernel%/vmlinuz*}/initramfs${kernel##*/vmlinuz}.img" ]]; then

		initrd="--initrd=/boot/initramfs-${kernel#*-}.img"

	else

		echo 'No initrd detected. Press a key to continue?'

		read key

	fi

	kexec -l --reuse-cmdline "$initrd" "$kernel"

	systemctl kexec