patch cleanup
6659 nvlist_free(NULL) is a no-op

*** 21,32 ****
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <sys/ctfs.h>
  #include <sys/contract.h>
  #include <string.h>
  #include <libnvpair.h>
  #include <assert.h>
--- 21,30 ----
*** 465,475 ****
  
  errout:
          if (event_buffer)
                  free(event_buffer);
          if (info) {
-                 if (info->nvl)
                          nvlist_free(info->nvl);
                  free(info);
          }
          return (error);
  }
--- 463,472 ----
*** 505,515 ****
  void
  ct_event_free(ct_evthdl_t evthdl)
  {
          struct ctlib_event_info *info = evthdl;
  
-         if (info->nvl)
                  nvlist_free(info->nvl);
          free(info);
  }
  
  
--- 502,511 ----