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

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

Change-Id: I19542d899e125125aa4a62cf30b3f88969d3a6d0