net: nfs: Remove unused define

Unreferenced, so remove the noise.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/net/nfs.h b/net/nfs.h
index d69b422..2a1f4db 100644
--- a/net/nfs.h
+++ b/net/nfs.h
@@ -44,8 +44,6 @@
 #define NFS_READ_SIZE 1024 /* biggest power of two that fits Ether frame */
 #endif
 
-#define NFS_MAXLINKDEPTH 16
-
 struct rpc_t {
 	union {
 		uint8_t data[2048];