usb: dwc3: core: avoid checkpatch.pl warning

trivial patch to avoid "over 80-chars" rule
break. No functional changes.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -140,7 +140,8 @@ static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
  * Returns a pointer to the allocated event buffer structure on success
  * otherwise ERR_PTR(errno).
  */
-static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc, unsigned length)
+static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
+		unsigned length)
 {
 	struct dwc3_event_buffer	*evt;