Fix hook doesn't return 0

This cause error in pacman:
(1/2) Remove DKMS modules
==> dkms remove vboxsf/6.0.0_OSE -k 4.20.0-seblu
(2/2) kernel-install remove
+ ((  EUID  ))
+ ((  1 != 1  ))
+ read -r path
+ kpath=/usr/lib/kernel/vmlinuz-4.20.0-seblu
+ kver=4.20.0-seblu
+ [[ -z 4.20.0-seblu ]]
+ case "$1" in
+ kernel-install remove 4.20.0-seblu
+ read -r path
error: command failed to execute correctly

hook.sh

@@ -48,3 +48,5 @@ while read -r path; do
 			usage ;;
 	esac
 done
+
+exit 0