[nrf fromtree] drivers: udc_dwc2: Optimize endpoint event clear

There is no point in calling k_event_test() to determine what events are
posted and then passing that value to k_event_clear(). Simply pass
UINT32_MAX to k_event_clear() and use the return value to slightly
reduce overhead.

Signed-off-by: Tomasz Moń <[email protected]>
(cherry picked from commit 2aa26ad)

Author: tmon-nordic

drivers/usb/udc/udc_dwc2.c

@@ -3026,8 +3026,7 @@ static ALWAYS_INLINE void dwc2_thread_handler(void *const arg)
 
 		if (!priv->hibernated) {
 			LOG_DBG("New transfer(s) in the queue");
-			eps = k_event_test(&priv->xfer_new, UINT32_MAX);
-			k_event_clear(&priv->xfer_new, eps);
+			eps = k_event_clear(&priv->xfer_new, UINT32_MAX);
 		} else {
 			/* Events will be handled after hibernation exit */
 			eps = 0;
@@ -3049,8 +3048,7 @@ static ALWAYS_INLINE void dwc2_thread_handler(void *const arg)
 		k_event_clear(&priv->drv_evt, BIT(DWC2_DRV_EVT_EP_FINISHED));
 
 		if (!priv->hibernated) {
-			eps = k_event_test(&priv->xfer_finished, UINT32_MAX);
-			k_event_clear(&priv->xfer_finished, eps);
+			eps = k_event_clear(&priv->xfer_finished, UINT32_MAX);
 		} else {
 			/* Events will be handled after hibernation exit */
 			eps = 0;