driver: wrap fd returned from nsm_init in Option #54
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Returning an Option instead of the raw file descriptor makes it easier for the caller to ensure that the file was opened successfully. It also forces them to handle any errors instead of allowing them to assume that it was successful, only to be met with "InternalError" when nsm_process_request is later used.
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Returning an Option instead of the raw file descriptor makes it easier for the caller to ensure that the file was opened successfully. It also forces them to handle any errors instead of allowing them to assume that it was successful, only to be met with "InternalError" when nsm_process_request is later used.
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