nl-link-stats: prefer RTNL_LINK_STATS_MAX over __RTNL_LINK_STATS_MAX
nl-link-stats: prefer RTNL_LINK_STATS_MAX over __RTNL_LINK_STATS_MAX

The result is basically the same, but I feel that __RTNL_LINK_STATS_MAX
is an internal variable that shouldn't be used. Thus, let's iterate
instead until <= MAX.

Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

tklauser/libnl,greearb/libnl-ct,dsahern/libnl,tklauser/libnl,tklauser/libnl,dsahern/libnl,HolyShitMan/libnl-1,HolyShitMan/libnl-1,greearb/libnl-ct,HolyShitMan/libnl-1,thom311/libnl,greearb/libnl-ct,HolyShitMan/libnl-1,dsahern/libnl,thom311/libnl,dsahern/libnl,thom311/libnl,tklauser/libnl