We fix up the missing null-terminator in the next line.

...as reported by "sparse"

The reallocation of an integer array was erroneous and resulted in
inconsistent memory changes. This fix solved the issue.
In addition, unnecessary persist calls have been removed.

- no tab after define/ifdef/ifndef
- no space after sizeof operator

Return an integer value in constructor. The non-zero value means the
allocation will be cancelled.