10129 smatch fix for dtrace tests

@@ -53,10 +53,10 @@
                 p[i] = argv[i];
         }
         p[i] = NULL;
 
         if (sysinfo(SI_ARCHITECTURE_64, isaname, sizeof (isaname)) != -1)
-                asprintf(av, "/usr/java/bin/%s/java", isaname);
+                (void) asprintf(av, "/usr/java/bin/%s/java", isaname);
 
         (void) execv(av[0], av);
         err(1, "exec failed");
 }