usb: Spelling s/enpoint/endpoint/

Fix misspellings of "endpoint".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Li Yang <leoyang.li@nxp.com>
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Link: https://lore.kernel.org/r/20191024152833.30698-1-geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc2/core.h

@@ -134,7 +134,7 @@ struct dwc2_hsotg_req;
  * @target_frame: Targeted frame num to setup next ISOC transfer
  * @frame_overrun: Indicates SOF number overrun in DSTS
  *
- * This is the driver's state for each registered enpoint, allowing it
+ * This is the driver's state for each registered endpoint, allowing it
  * to keep track of transactions that need doing. Each endpoint has a
  * lock to protect the state, to try and avoid using an overall lock
  * for the host controller as much as possible.