drivers: usb_dc_nrfx: free memory if event is intended to be dropped

Free memory block if event is intended to be dropped.

Resolves: #20953

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

drivers/usb/device/usb_dc_nrfx.c

@@ -1246,6 +1246,7 @@ static void usbd_work_handler(struct k_work *item)
 	while ((ev = usbd_evt_get()) != NULL) {
 		if (!dev_ready() && ev->evt_type != USBD_EVT_POWER) {
 			/* Drop non-power events when cable is detached. */
+			usbd_evt_free(ev);
 			continue;
 		}