Backend: don't check anykernel.sh before it's been extracted

- if it does not exist yet (i.e. hasn't been extracted) then assume cleanuponabort=1 since there wouldn't be anything to see on a failed extraction
- hide any missing file errors from file_getprop here now that we've taken care of that case

META-INF/com/google/android/update-binary

@@ -24,11 +24,13 @@ set_perm_recursive() {
 file_getprop() { grep "^$2" "$1" | cut -d= -f2; }
 getprop() { test -e /sbin/getprop && /sbin/getprop $1 || file_getprop /default.prop $1; }
 cleanup() { rm -rf /tmp/anykernel; }
-if [ "$(file_getprop /tmp/anykernel/anykernel.sh do.cleanuponabort)" == 1 ]; then
-    abort() { ui_print "$*"; cleanup; umount /system; umount /data; exit 1; }
+abort() {
+  if [ ! -f /tmp/anykernel/anykernel.sh -o "$(file_getprop /tmp/anykernel/anykernel.sh do.cleanuponabort 2>/dev/null)" == 1 ]; then
+    ui_print "$*"; cleanup; umount /system; umount /data; exit 1;
   else
-    abort() { ui_print "$*"; umount /system; umount /data; exit 1; }
-fi;
+    ui_print "$*"; umount /system; umount /data; exit 1;
+  fi;
+}
 
 show_progress 1.34 4;
 ui_print " ";