pcm: Return unsigned int if error occurs by `read` or `write` system call

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alsa-project/alsa-lib pull request #242 was opened from Korilakkuma:

`read` or `write` system call returns `-1` if error occurs.

Request URL   : https://github.com/alsa-project/alsa-lib/pull/242
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/242.patch
Repository URL: https://github.com/alsa-project/alsa-lib



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