10090 rt2860_free_rx_ring doesn't need to check for NULL array

*** 1,9 ****
--- 1,10 ----
  /*
   * Copyright 2017 Gary Mills
   * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
+  * Copyright (c) 2018, Joyent, Inc.
   */
  
  /*
   * Copyright (c) 2007, 2008
   *      Damien Bergamini <damien.bergamini@free.fr>
*** 898,913 ****
  
          if (ring->rxd != NULL)
                  rt2860_free_dma_mem(&ring->rxdesc_dma);
  
          count = RT2860_RX_RING_COUNT;
!         if (ring->data != NULL) {
                  for (i = 0; i < count; i++) {
                          data = &ring->data[i];
                          rt2860_free_dma_mem(&data->rxbuf_dma);
                  }
-         }
  }
  
  static int
  rt2860_alloc_tx_pool(struct rt2860_softc *sc)
  {
--- 899,913 ----
  
          if (ring->rxd != NULL)
                  rt2860_free_dma_mem(&ring->rxdesc_dma);
  
          count = RT2860_RX_RING_COUNT;
! 
          for (i = 0; i < count; i++) {
                  data = &ring->data[i];
                  rt2860_free_dma_mem(&data->rxbuf_dma);
          }
  }
  
  static int
  rt2860_alloc_tx_pool(struct rt2860_softc *sc)
  {