NEX-9755 Race in libshare can cause zfs set sharenfs to fail
Reviewed by: Rick McNeal <rick.mcneal@nexenta.com>
Reviewed by: Gordon Ross <gordon.ross@nexenta.com>

*** 83,92 ****
--- 83,93 ----
          int     (*sa_command_help)();
          int     (*sa_delete_proto_section)(char *);
  };
  
  struct sa_proto_handle {
+         int                     sa_ref_count;
          int                     sa_num_proto;
          char                    **sa_proto;
          struct sa_plugin_ops    **sa_ops;
  };