init_resize.sh: fixes to make it work after tests on aarch64

src/init_resize.sh

@@ -113,18 +113,20 @@ main () {
   check_kernel
 
   if [ "$ROOT_PART_END" -eq "$TARGET_END" ]; then
-    reboot_pi
-  fi
-
+    # Issue a warning but continue trying to resize filesystem
+    echo "Warning: root partition already resized\n"
+  else
     if ! parted -m "$ROOT_DEV" u s resizepart "$ROOT_PART_NUM" "$TARGET_END"; then
       FAIL_REASON="Root partition resize failed"
       return 1
     fi
+  fi
 
-  if ! resize2fs "$ROOT_DEV"; then
-    FAIL_REASON="Root filesystem resize failed"
+  mount / -o remount,rw
+  if ! resize2fs "$ROOT_PART_DEV"; then
     return 1
   fi
+  mount / -o remount,ro
 
   fix_partuuid