[patch] getifaddrs.3: fix a memory leak in sample code

["Lucio Maciel" <luciofm@xxxxxxxxx>]

Hi, there is a memory leak in the sample usage code in the getifaddrs
(3) man page.

The code doesnt save the head pointer of the list, an then passes a
NULL pointer to the freeifaddrs(3) leaving all the memory unfreed.

Lúcio Maciel
luciofm@xxxxxxxxx

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