* Lists the size in bytes of each file when `ls -s` is invoked
* Prints '--' to indicate directory sizes are not calculated yet

Co-authored-by: Nathan Hsiao <nnh12@DESKTOP-EQ10QSJ>

…heseus-os#1105)

The duplicate region was created due to a bug
in the `check_and_add_free_region` function:
After returning from a recursive call, the original area's
end frame should be updated to *not include* th
 region that was just added to the free list.

…us-os#1104)