Fix typos concerning hierarchy

        heirarchical, hierachical -> hierarchical
        heirarchy, hierachy -> hierarchy

Signed-off-by: Uwe Kleine-König <zeisberg@informatik.uni-freiburg.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index f7fa52b..28dd757 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -1098,7 +1098,7 @@
 			BUG();
 	}
 
-	/* Assume a directory heirarchy thusly:
+	/* Assume a directory hierarchy thusly:
 	 * a/b/c
 	 * a/d
 	 * a,b,c, and d are all directories.