NFS: eliminate NIPQUAD(clp->cl_addr.sin_addr)

To ensure the NFS client displays IPv6 addresses properly, replace
address family-specific NIPQUAD() invocations with a call to the RPC
client to get a formatted string representing the remote peer's
address.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Aurelien Charbon <aurelien.charbon@ext.bull.net>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 5608e6a..75f3cbf 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -491,8 +491,9 @@
 
 	nfs_show_mount_options(m, nfss, 0);
 
-	seq_printf(m, ",addr="NIPQUAD_FMT,
-		NIPQUAD(nfss->nfs_client->cl_addr.sin_addr));
+	seq_printf(m, ",addr=%s",
+			rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
+							RPC_DISPLAY_ADDR));
 
 	return 0;
 }