Andreas Kling a9204510a4 Kernel: Make file description lookup return KResultOr ...

Instead of checking it at every call site (to generate EBADF), we make
file_description(fd) return a KResultOr<NonnullRefPtr<FileDescription>>.

This allows us to wrap all the calls in TRY(). :^)

The only place that got a little bit messier from this is sys$mount(),
and there's a whole bunch of things there in need of cleanup.

2021-09-05 18:36:13 +02:00

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