10137 smatch fixes for setuname

@@ -25,11 +25,13 @@
 /*
  * 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 */
+/*
+ * Copyright (c) 2018, Joyent, Inc.
+ */
 
 /*
  *  setuname [-t] [-s name] [-n node] 
  */
 

@@ -450,11 +452,11 @@
                             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);
+                (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) &&