shell: hide stderr from kver()
it messes up the terminal if there are errors:
bash $ mkinitcpio -k 6od: /boot/initramfs-6.1.101_1.img: Permission non accordée
.1.101_1 -
zsh $ mkinitcpio -k …od: /boot/initramfs-6.1.101_1.img: Permission non accordée
/bmkinitcpio -k /boot/vmlinuz-6.1.101_1
/boot/vmlinuz-6.1.101_1 6.1.101_1