DMA engine: typo fixes

Spelling fixes for dmaengine.[ch]

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index b4d84ed..d08a5c5 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -404,7 +404,7 @@
  * @last_used: last cookie value handed out
  *
  * dma_async_is_complete() is used in dma_async_memcpy_complete()
- * the test logic is seperated for lightweight testing of multiple cookies
+ * the test logic is separated for lightweight testing of multiple cookies
  */
 static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
 			dma_cookie_t last_complete, dma_cookie_t last_used)