5255 uts shouldn't open-code ISP2

@@ -23,10 +23,11 @@
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
  */
 
+#include <sys/sysmacros.h>
 #include <sys/conf.h>
 #include <sys/file.h>
 #include <sys/ddi.h>
 #include <sys/sunddi.h>
 #include <sys/modctl.h>

@@ -1834,11 +1835,11 @@
         }
         if (slu->slu_write_protected) {
                 sl->sl_flags |= SL_WRITE_PROTECTED;
         }
         if (slu->slu_blksize_valid) {
-                if ((slu->slu_blksize & (slu->slu_blksize - 1)) ||
+                if (!ISP2(slu->slu_blksize) ||
                     (slu->slu_blksize > (32 * 1024)) ||
                     (slu->slu_blksize == 0)) {
                         *err_ret = SBD_RET_INVALID_BLKSIZE;
                         ret = EINVAL;
                         goto scm_err_out;