usbdev-composite: fix enumeration error for 192 bytes desc

when the size of the usb configuration descriptor
is a multiple of 64 integers, only for this size less than wlength,
host do need send ZLP

Signed-off-by: sunkun3 <sunkun3@xiaomi.com>

drivers/usbdev/composite.c

@@ -680,7 +680,12 @@ static int composite_setup(FAR struct usbdevclass_driver_s *driver,
       /* Setup the request */
 
       ctrlreq->len   = MIN(len, ret);
-      ctrlreq->flags = USBDEV_REQFLAGS_NULLPKT;
+
+      /* Only when ret is less than len do zero length packet
+       * need to be sent
+       */
+
+      ctrlreq->flags = ret < len ? USBDEV_REQFLAGS_NULLPKT : 0;
 
       /* And submit the request to the USB controller driver */