[PATCH] make analyzer track memory allocated by if_nameindex

[Daniel Fahlgren]

Hi,

The MallocChecker does currently not track the memory allocated by
if_nameindex. That memory is dynamically allocated and should be freed
by calling if_freenameindex. The attached patch teaches the checker
about these functions.

Memory allocated by if_nameindex is treated as a separate allocation
"family". That way the checker can verify it is freed by the correct
function.

Any comments / feedback?

Best regards,
Daniel Fahlgren
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