SUNRPC: Fix sockaddr handling in svcsock_accept_class trace points

Avoid potentially hazardous memory copying and the needless use of
"%pIS" -- in the kernel, an RPC service listener is always bound to
ANYADDR. Having the network namespace is helpful when recording
errors, though.

Fixes: a0469f46 ("SUNRPC: Replace dprintk call sites in TCP state change callouts")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

include/trace/events/sunrpc.h

@@ -2125,17 +2125,17 @@ DECLARE_EVENT_CLASS(svcsock_accept_class,
 	TP_STRUCT__entry(
 		__field(long, status)
 		__string(service, service)
-		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
+		__field(unsigned int, netns_ino)
 	),
 
 	TP_fast_assign(
 		__entry->status = status;
 		__assign_str(service, service);
-		memcpy(__entry->addr, &xprt->xpt_local, sizeof(__entry->addr));
+		__entry->netns_ino = xprt->xpt_net->ns.inum;
 	),
 
-	TP_printk("listener=%pISpc service=%s status=%ld",
-		__entry->addr, __get_str(service), __entry->status
+	TP_printk("addr=listener service=%s status=%ld",
+		__get_str(service), __entry->status
 	)
 );