sysdeps/managarm: unify error handling code for fs, posix protocols#959

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ElectrodeYT wants to merge 2 commits intomanagarm:masterfrom ElectrodeYT:error_handling_1

+165-52

Commits on Dec 22, 2023

sysdeps/managarm: handle more errors in sys_socket
ElectrodeYT
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[WIP] sysdeps/managarm: move posix, fs error to c error conversion out
ElectrodeYT
committed