SUNRPC: Clean up svc_deferred_class trace events

Replace the temporary fix from commit 4d500445 ("SUNRPC: Fix the
svc_deferred_event trace class") with the use of __sockaddr and
friends, which is the preferred solution (but only available in 5.18
and newer).
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

include/trace/events/sunrpc.h

@@ -2015,19 +2015,18 @@ DECLARE_EVENT_CLASS(svc_deferred_event,
 	TP_STRUCT__entry(
 		__field(const void *, dr)
 		__field(u32, xid)
-		__array(__u8, addr, INET6_ADDRSTRLEN + 10)
+		__sockaddr(addr, dr->addrlen)
 	),
 
 	TP_fast_assign(
 		__entry->dr = dr;
 		__entry->xid = be32_to_cpu(*(__be32 *)(dr->args +
 						       (dr->xprt_hlen>>2)));
-		snprintf(__entry->addr, sizeof(__entry->addr) - 1,
-			 "%pISpc", (struct sockaddr *)&dr->addr);
+		__assign_sockaddr(addr, &dr->addr, dr->addrlen);
 	),
 
-	TP_printk("addr=%s dr=%p xid=0x%08x", __entry->addr, __entry->dr,
-		__entry->xid)
+	TP_printk("addr=%pISpc dr=%p xid=0x%08x", __get_sockaddr(addr),
+		__entry->dr, __entry->xid)
 );
 
 #define DEFINE_SVC_DEFERRED_EVENT(name) \