kNFSd - 2 of 4 - Fix incorrect call for follow_up

### Comments for ChangeSet

follow_up doesn't check that the passed dentry is at the root of the mounted file system, so we have to do that, to avoid calling follow_up too many times.

----------- Diffstat output ------------

 ./fs/nfsd/vfs.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff ./fs/nfsd/vfs.c~current~ ./fs/nfsd/vfs.c
@@ -161,7 +161,7 @@ nfsd_lookup(struct svc_rqst *rqstp, stru
 			struct dentry *dp;
 			struct vfsmount *mnt = mntget(exp->ex_mnt);
 			dentry = dget(dparent);
-			while(follow_up(&mnt, &dentry))
+			while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
 				;
 			dp = dget_parent(dentry);
 			dput(dentry);

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