fix typos concerning "initiali[zs]e"

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 236b834..146f1f6 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2918,7 +2918,7 @@
  * One of more index blocks maybe needed if the extent tree grow after
  * the unintialized extent split. To prevent ENOSPC occur at the IO
  * complete, we need to split the uninitialized extent before DIO submit
- * the IO. The uninitilized extent called at this time will be split
+ * the IO. The uninitialized extent called at this time will be split
  * into three uninitialized extent(at most). After IO complete, the part
  * being filled will be convert to initialized by the end_io callback function
  * via ext4_convert_unwritten_extents().