These patches fix some bugs found when modifying files in vvfat.
First, there was a bug when writing to the second+ cluster of a file, it
will copy the cluster before it instead.
Another issue was modifying the clusters of a file and adding new
clusters, this showed 2 issues:
- If the new cluster is not immediately after the last cluster, it will
cause issues when reading from this file in the future.
- Generally, the usage of info.file.offset was incorrect, and the
system would crash on abort() when the file is modified and a new
cluster was added.