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pal: linux: Rewrite I2C & GPIO abstractions layers #51

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Ref PR #50

Properly handle errors and format source code.

Signed-off-by: Sven Schwermer <[email protected]>
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Encountered error messages during first run after power up. Subsequent execution error message will not appear again.
Failed to open GPIO #xx direction file for writing: Permission denied
Failed to write GPIO pin # xx: Bad file descriptor

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