5910 libnisdb won't build with modern GCC

*** 21,30 ****
--- 21,32 ----
  /*
   *      nis_db.cc
   *
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
+  *
+  * Copyright 2015 RackTop Systems.
   */
  
  
  #include <sys/param.h>
  #include <strings.h>
*** 142,152 ****
  extern "C" {
  
  bool_t
  db_in_dict_file(char *name)
  {
!         return ((bool_t) InUseDictionary->find_table_desc(name));
  
  }
  
  const char
  *db_perror(db_status dbstat)
--- 144,154 ----
  extern "C" {
  
  bool_t
  db_in_dict_file(char *name)
  {
!         return (InUseDictionary->find_table_desc(name) != NULL);
  
  }
  
  const char
  *db_perror(db_status dbstat)