ACT8945A: Correct DEBUGASSERT code error, plus tidy ups #8742
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Summary
Found a silly DEBUGASSERT logical error.
Whilst correcting this spotted a _err formatting warning; fixed and slightly amended it to fix the warning. Also attempted to fix a previously raised concern about C89 compatibility.
Impact
None, unless you have DEBUGASSERTS enabled in which case it will no longer assert because of the error.
Testing
Custom board: SAMA5D27C-D1G with act8945a regulator