7974 Some USB3 drives don't attach
Reviewed by: Dan McDonald <danmcd@omniti.com>

*** 21,31 ****
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   *
   * Copyright 2014 Garrett D'Amore <garrett@damore.org>
!  * Copyright 2016 Joyent, Inc.
   */
  
  /*
   * USBA: Solaris USB Architecture support
   *
--- 21,31 ----
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   *
   * Copyright 2014 Garrett D'Amore <garrett@damore.org>
!  * Copyright 2017 Joyent, Inc.
   */
  
  /*
   * USBA: Solaris USB Architecture support
   *
*** 1140,1149 ****
--- 1140,1150 ----
                  n_cvs_ptr = &state->st_curr_alt->altif_n_cvs;
                  cvs_ptr = &state->st_curr_alt->altif_cvs;
                  break;
  
          case USB_DESCR_TYPE_EP:
+         case USB_DESCR_TYPE_SS_EP_COMP:
                  n_cvs_ptr = &state->st_curr_ep->ep_n_cvs;
                  cvs_ptr = &state->st_curr_ep->ep_cvs;
                  break;
  
          default: