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This ensures that files that were replaced due to O_CREAT, will now be
emptied when O_TRUNC is passed (which is the default).

In the future we should add CI with a rustfmt check, making correct
formatting a hard requirement.

ramfs: Fix duplicated files bug

See merge request !3

Previously ramfs allowed identical filenames to be created if the
O_CREAT flag was used. This patch fixes the behavior and instead
opens the existing file as long as O_EXCL is not specified.

This reverts merge request !1

Fix missing 'use ENOENT'

See merge request !2

ramfs: SchemeMut: return ENOENT in filesystem calls when file does not exist

See merge request !1