Frees dynamic memory allocated by if_nameindex() to the array of
    interface names and indexes
    Format
      #include  <if.h>
      void if_freenameindex  ( struct if_nameindex *ptr );

1  –  Arguments

 ptr
    Points to an array of structures returned by the if_nameindex()
    function.

2  –  Description

    The if_freenameindex() function frees dynamic memory allocated to
    the array of interface names and indexes that the if_nameindex()
    function returned.