nfsd: remove the redundant mapping of nfserr_mlink

There two mappings of nfserr_mlink in nfs_errtbl.
Remove one of them.

Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: Li Lingfeng

fs/nfsd/vfs.c

@@ -71,7 +71,6 @@ nfserrno (int errno)
 		{ nfserr_acces, -EACCES },
 		{ nfserr_exist, -EEXIST },
 		{ nfserr_xdev, -EXDEV },
-		{ nfserr_mlink, -EMLINK },
 		{ nfserr_nodev, -ENODEV },
 		{ nfserr_notdir, -ENOTDIR },
 		{ nfserr_isdir, -EISDIR },