10137 smatch fixes for setuname

*** 25,35 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "%Z%%M% %I%     %E% SMI"       /* SVr4.0 1.3 */
  
  /*
   *  setuname [-t] [-s name] [-n node] 
   */
  
--- 25,37 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! /*
!  * Copyright (c) 2018, Joyent, Inc.
!  */
  
  /*
   *  setuname [-t] [-s name] [-n node] 
   */
  
*** 450,460 ****
                              sizeof (utsname.sysname));
                  if (nodename)
                          (void) strncpy(utsname.nodename, nodename,
                              sizeof (utsname.nodename));
                  (void) kvm_kwrite(kd, utsname_addr, &utsname, sizeof (utsname));
!                 kvm_close(kd);
          } else
                  return (-1);
  #else /* sun */
          if ((memfd = open("/dev/kmem", O_RDWR, 0)) > 0) {
              if ((lseek(memfd, (long) utsname_addr, SEEK_SET) != -1) && 
--- 452,462 ----
                              sizeof (utsname.sysname));
                  if (nodename)
                          (void) strncpy(utsname.nodename, nodename,
                              sizeof (utsname.nodename));
                  (void) kvm_kwrite(kd, utsname_addr, &utsname, sizeof (utsname));
!                 (void) kvm_close(kd);
          } else
                  return (-1);
  #else /* sun */
          if ((memfd = open("/dev/kmem", O_RDWR, 0)) > 0) {
              if ((lseek(memfd, (long) utsname_addr, SEEK_SET) != -1) &&