I accidentally broke IPv4 traceroute, by swapping iph->saddr
and iph->daddr.

Probably because raw_icmp_error() and raw_v4_input()
use different order for iph->saddr and iph->daddr.

Fixes: ba44f818 ("raw: use more conventional iterators")
Reported-by: NJohn Sperbeck <jsperbeck@google.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220623193540.2851799-1-edumazet@google.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>