dracut/vmklive/adduser.sh: detect live.autologin properly

if just `live.autologin` is added to the KCL, it would not be detected
and the user would still need to log into the live image.

dracut/vmklive/adduser.sh

@@ -2,11 +2,12 @@
 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
 # ex: ts=8 sw=4 sts=4 et filetype=sh
 
-type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+if ! type getarg >/dev/null 2>&1 && ! type getargbool >/dev/null 2>&1; then
+    . /lib/dracut-lib.sh
+fi
 
 echo void-live > ${NEWROOT}/etc/hostname
 
-AUTOLOGIN=$(getarg live.autologin)
 USERNAME=$(getarg live.user)
 USERSHELL=$(getarg live.shell)
 
@@ -51,6 +52,6 @@ _EOF
     chroot ${NEWROOT} chown polkitd:polkitd /etc/polkit-1/rules.d/void-live.rules
 fi
 
-if [ -n "$AUTOLOGIN" ]; then
+if getargbool 0 live.autologin; then
         sed -i "s,GETTY_ARGS=\"--noclear\",GETTY_ARGS=\"--noclear -a $USERNAME\",g" ${NEWROOT}/etc/sv/agetty-tty1/conf
 fi