5255 uts shouldn't open-code ISP2

*** 23,32 ****
--- 23,33 ----
   * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   * Copyright 2014, OmniTI Computer Consulting, Inc. All rights reserved.
   */
  /* Copyright (c) 1990 Mentat Inc. */
  
+ #include <sys/sysmacros.h>
  #include <sys/types.h>
  #include <sys/stream.h>
  #include <sys/stropts.h>
  #include <sys/strlog.h>
  #include <sys/strsun.h>
*** 4382,4392 ****
          us->us_min_anonpriv_port = 512;
  
          us->us_bind_fanout_size = udp_bind_fanout_size;
  
          /* Roundup variable that might have been modified in /etc/system */
!         if (us->us_bind_fanout_size & (us->us_bind_fanout_size - 1)) {
                  /* Not a power of two. Round up to nearest power of two */
                  for (i = 0; i < 31; i++) {
                          if (us->us_bind_fanout_size < (1 << i))
                                  break;
                  }
--- 4383,4393 ----
          us->us_min_anonpriv_port = 512;
  
          us->us_bind_fanout_size = udp_bind_fanout_size;
  
          /* Roundup variable that might have been modified in /etc/system */
!         if (!ISP2(us->us_bind_fanout_size)) {
                  /* Not a power of two. Round up to nearest power of two */
                  for (i = 0; i < 31; i++) {
                          if (us->us_bind_fanout_size < (1 << i))
                                  break;
                  }