NFS: Display compressed (shorthand) IPv6 in /proc/mounts

Recent changes to snprintf() introduced the %pI6c formatter, which can
display an IPv6 address with standard shorthanding.  Use this new
formatter when displaying IPv6 server addresses in /proc/mounts.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/super.c

@@ -546,7 +546,7 @@ static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 	}
 	case AF_INET6: {
 		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
-		seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
+		seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
 		break;
 	}
 	default: