nfs: remove unused NFS_CALL macro

Nothing uses this, and thank goodness, as the syntax looks horrid.

Signed-off-by: Jeff Layton <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

include/linux/nfs_xdr.h

···
 };
 
 /*
- * 	NFS_CALL(getattr, inode, (fattr));
- * into
- *	NFS_PROTO(inode)->getattr(fattr);
- */
-#define NFS_CALL(op, inode, args)	NFS_PROTO(inode)->op args
-
-/*
  * Function vectors etc. for the NFS client
  */
 extern const struct nfs_rpc_ops	nfs_v2_clientops;