all: don't use static buffer for nm_utils_inet*_ntop()
While nm_utils_inet*_ntop() accepts a %NULL buffer to fallback to a static buffer, don't do that. I find the possibility of using a static buffer here error prone and something that should be avoided. There is of course the downside, that in some cases it requires an additional line of code to allocate the buffer on the stack as auto-variable.
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