[JFFS2] Use d_splice_alias() not d_add() in jffs2_lookup()

Now that JFFS2 can be exported by NFS, we need to get this right.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index b1aaae8..621bdfa 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -108,9 +108,7 @@
 		}
 	}
 
-	d_add(target, inode);
-
-	return NULL;
+	return d_splice_alias(inode, target);
 }
 
 /***********************************************************************/