Prevent unused parameter warning

[Pharap]

While testing something unrelated (I don't actually own a SAM board) I noticed the compiler was generating a warning:

syscalls_sam3.c:133:24: warning: unused parameter 'status' [-Wunused-parameter]

So I thought I'd submit a PR to fix the issue. By the looks of the commented-out printf, it seems that not marking status as UNUSED after commenting out the printf was probably just an oversight.

[CLAassistant]

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[Pharap]

Do I really have to authorise CLAassistant just to submit such a tiny commit?