dma: fix comments

Correct spelling typo in drivers/dma.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 7292aa8..7efd763 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -169,9 +169,9 @@
 }
 
 /**
- * atc_desc_chain - build chain adding a descripor
- * @first: address of first descripor of the chain
- * @prev: address of previous descripor of the chain
+ * atc_desc_chain - build chain adding a descriptor
+ * @first: address of first descriptor of the chain
+ * @prev: address of previous descriptor of the chain
  * @desc: descriptor to queue
  *
  * Called from prep_* functions
@@ -786,7 +786,7 @@
 }
 
 /**
- * atc_dma_cyclic_fill_desc - Fill one period decriptor
+ * atc_dma_cyclic_fill_desc - Fill one period descriptor
  */
 static int
 atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc,