9971 Make getrandom(2) a public interface

*** 8,18 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright (c) 2015, Joyent, Inc.
   */
  
  /*
   * getentropy(3C) is an OpenBSD compatible wrapper around getrandom(2).
   */
--- 8,18 ----
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright (c) 2018, Joyent, Inc.
   */
  
  /*
   * getentropy(3C) is an OpenBSD compatible wrapper around getrandom(2).
   */
*** 21,31 ****
  #include <sys/random.h>
  
  int
  getentropy(void *buf, size_t buflen)
  {
!         int ret;
  
          if (buflen > 256) {
                  errno = EIO;
                  return (-1);
          }
--- 21,31 ----
  #include <sys/random.h>
  
  int
  getentropy(void *buf, size_t buflen)
  {
!         ssize_t ret;
  
          if (buflen > 256) {
                  errno = EIO;
                  return (-1);
          }