Fix survival script for AVB 1.0 signed boot image

scripts/addon.d.sh

@@ -13,6 +13,7 @@
 main() {
   # Magisk binaries
   MAGISKBIN=/data/adb/magisk
+  APK=/data/magisk.apk
 
   mount /data 2>/dev/null
 
@@ -42,6 +43,9 @@ main() {
   [ -z $BOOTIMAGE ] && abort "! Unable to detect boot image"
   ui_print "- Found boot image: $BOOTIMAGE"
 
+  eval $BOOTSIGNER -verify < $BOOTIMAGE && BOOTSIGNED=true
+  $BOOTSIGNED && ui_print "- Boot image is signed with AVB 1.0"
+
   SOURCEDMODE=true
   cd $MAGISKBIN