Coding Style cleanup

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/serial/atmel_usart.h b/drivers/serial/atmel_usart.h
index 7cfc2d5..7e4b2c9 100644
--- a/drivers/serial/atmel_usart.h
+++ b/drivers/serial/atmel_usart.h
@@ -42,7 +42,7 @@
 	u32	reserved1;
 	u32	ifr;
 	u32	man;
-	u32	reserved2[54]; // version and PDC not needed
+	u32	reserved2[54]; /* version and PDC not needed */
 } atmel_usart3_t;
 
 /* Bitfields in CR */