Check what you got under /use/lib/modules. If no linux57-58 folders there, then you can remove related files in /boot and /etc/mkinitcpio.d manually. Otherwise, you need to uninstall linux57-58 with pacman.
Check what you got under /use/lib/modules. If no linux57-58 folders there, then you can remove related files in /boot and /etc/mkinitcpio.d manually. Otherwise, you need to uninstall linux57-58 with pacman.