Spelling fixes: lenght->length

Signed-off-by: Paulius Zaleckas <pauliusz@yahoo.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/fs/jfs/jfs_xtree.c b/fs/jfs/jfs_xtree.c
index 1543906..a000aaa 100644
--- a/fs/jfs/jfs_xtree.c
+++ b/fs/jfs/jfs_xtree.c
@@ -3965,7 +3965,7 @@
  *	xtTruncate_pmap()
  *
  * function:
- *	Perform truncate to zero lenghth for deleted file, leaving the
+ *	Perform truncate to zero length for deleted file, leaving the
  *	the xtree and working map untouched.  This allows the file to
  *	be accessed via open file handles, while the delete of the file
  *	is committed to disk.