Merge "fsck_msdosfs: truncate directory entry when the head pointer is invalid." am: 023cbbf051 am: ab03d40eae am: d0bbf5abf8 am: e6c9fb0ad2

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

Change-Id: I46a6a1e90f8b946f0a950a9f0e30d27e90eec052