sit: don't print ip6rd_prefix as integer in sit_dump_details()
sit: don't print ip6rd_prefix as integer in sit_dump_details()

First of all, inet_ntop() has no reason to fail (ever). As long
as the input arguments point to valid data and family is not bogus.

But when it fails, we cannot pass a 'struct in6_addr' to "%x"
either, so just don't do that.

Same for printing ip6rd_relay_prefix as AF_INET. If our addr-to-str
method fails, we don't want to come up with something fancy. Otherwise,
we'd just implement a inet_ntop() that does not fail.

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

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