- Use copyinstr() to read cs_win, cs_dos, cs_local strings from the
mount argument structure instead of reading through user-space pointers(!).
- When mounting a filesystem, or updating an existing mount, only try to
update the iconv handles from the information in the mount argument
structure if the structure itself has the MSDOSFSMNT_KICONV flag set.
- Attempt to handle failure of update_mp() in the MNT_UPDATE case.
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