tcp: Use pI6c in tcp tracepoint

The compact form for IPv6 addresses is more user friendly than the full
version. For example:
   compact: 2001:db8:1::1
      full: 2001:0db8:0001:0000:0000:0000:0000:0004i

Update the tcp tracepoint to show the compact form.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/trace/events/tcp.h

@@ -57,7 +57,7 @@ TRACE_EVENT(tcp_retransmit_skb,
 		}
 	),
 
-	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6 daddrv6=%pI6",
+	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
 		  __entry->sport, __entry->dport, __entry->saddr, __entry->daddr,
 		  __entry->saddr_v6, __entry->daddr_v6)
 );