Fix spelling of "transferred".

Signed-off-by: Vagrant Cascadian <vagrant@debian.org>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/usb.c b/common/usb.c
index 45a5a0f..4d0de4d 100644
--- a/common/usb.c
+++ b/common/usb.c
@@ -210,7 +210,7 @@
  * clear keyboards LEDs). For data transfers, (storage transfers) we don't
  * allow control messages with 0 timeout, by previousely resetting the flag
  * asynch_allowed (usb_disable_asynch(1)).
- * returns the transfered length if OK or -1 if error. The transfered length
+ * returns the transferred length if OK or -1 if error. The transferred length
  * and the current status are stored in the dev->act_len and dev->status.
  */
 int usb_control_msg(struct usb_device *dev, unsigned int pipe,