10075 make usr/src/tools smatch clean

@@ -9,10 +9,11 @@
  * http://www.illumos.org/license/CDDL.
  */
 
 /*
  * Copyright 2011 Jason King.  All rights reserved.
+ * Copyright (c) 2018, Joyent, Inc.
  */
 
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

@@ -130,11 +131,11 @@
             (char *const *)cmd, environ)) != 0) {
                 warnx("could not exec mcs: %s", strerror(rc));
                 return (B_FALSE);
         }
 
-        waitpid(pid, &stat, 0);
+        (void) waitpid(pid, &stat, 0);
         if (!WIFEXITED(stat) || WEXITSTATUS(stat) != 0) {
                 warnx("Removing CTF information from %s failed", filename);
                 return (B_FALSE);
         }