The missing part of r232588 that documents ifaddr_byindex() itself.
MFC after: 1 week
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@ -1351,6 +1351,10 @@ precisely
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.Fa addr
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will be returned.
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.Pp
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.Fn ifaddr_byindex
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returns the link-level address of the interface with the given index
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.Fa idx .
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.Pp
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All of these functions return a null pointer if no such address can be
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found.
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.Ss "Interface Multicast Address Functions"
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