RedBoot: fis delete won't erase

[Gary Thomas]

David Vrabel said:
> Hi,
>
> fis delete no longer needs to erase the flash as fis free now uses the
> FIS directory to determine free space.  Erasing the flash twice (once
> for fis delete and then again for fis create) is also unnecessary.
>

I'll look at this when I'm back in my office, but in reality, it
doesn't really matter to be extra thorough - the "erase" routines
are optimized to check for erased data and avoid touching the device
if the segment is already blank.