Warning fixes (#1227)

[Holger Weiß]

We have an `xasprintf()` function in `plugins/utils.c`, we should just use that consistently across the code.

But I like the `" \b"` hack! :-)

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Reply to this email directly or view it on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/pull/1227#issuecomment-33016507
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