NFS: Clean-up: fix a compiler warning in fs/nfs/super.c

/home/cel/linux/fs/nfs/super.c: In function 'nfs_pseudoflavour_to_name':
/home/cel/linux/fs/nfs/super.c:270: warning: comparison between signed and unsigned

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index aab5cd6..6eac5bf 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -263,11 +263,11 @@
 		{ RPC_AUTH_GSS_SPKM, "spkm" },
 		{ RPC_AUTH_GSS_SPKMI, "spkmi" },
 		{ RPC_AUTH_GSS_SPKMP, "spkmp" },
-		{ -1, "unknown" }
+		{ UINT_MAX, "unknown" }
 	};
 	int i;
 
-	for (i=0; sec_flavours[i].flavour != -1; i++) {
+	for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 		if (sec_flavours[i].flavour == flavour)
 			break;
 	}