USB: Fix spelling in usb/serial.h

Fixes a minor typo in the comments for usb_set_serial_data.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 655341d..0b8617a 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -192,7 +192,7 @@
  * The driver.owner field should be set to the module owner of this driver.
  * The driver.name field should be set to the name of this driver (remember
  * it will show up in sysfs, so it needs to be short and to the point.
- * Useing the module name is a good idea.)
+ * Using the module name is a good idea.)
  */
 struct usb_serial_driver {
 	const char *description;