sunrpc: Fix build warning due to typo in %pI4 format changes.

Noticed by Stephen Hemminger.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sunrpc/xprtsock.c

@@ -284,7 +284,7 @@ static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
 
 	buf = kzalloc(20, GFP_KERNEL);
 	if (buf) {
-		snprintf(buf, 20, "pI4", &addr->sin_addr.s_addr);
+		snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr);
 	}
 	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;