Fix "No devices found" error during shutdown

This fixes an issue introduced by voidlinux/void-runit#75 whereby
dmsetup returns "No devices found" on shutdown on systems with no
encrypted volumes, which is then interpreted as integral vaules "No",
"devices" and "found", resulting in Illegal number errors.

Author: Aloz1

functions

@@ -50,7 +50,7 @@ deactivate_crypt() {
    if [ -x /sbin/dmsetup -o -x /bin/dmsetup ]; then
        msg "Deactivating Crypt Volumes"
        for v in $(dmsetup ls --target crypt --exec "dmsetup info -c --noheadings -o open,name"); do
-           [ ${v%%:*} -eq 0 ] && cryptsetup close ${v##*:}
+           [ ${v%%:*} = "0" ] && cryptsetup close ${v##*:}
        done
        deactivate_vgs "Crypt"
    fi