Merge "fsck_msdosfs: truncate directory entry when the head pointer is invalid." am: 023cbbf051 am: ab03d40eae

Original change: https://android-review.googlesource.com/c/platform/external/fsck_msdos/+/1881794

Change-Id: If6bf1a92e2dc66d93a8c67245052ca9096bc274e