Invoke tzset(3) within the main loop to catch changes to /etc/localtime

when running as a daemon in the hope that it will fix situations
where the CMOS clock was apparently set using the stale TZ offset.

sbin/adjkerntz/adjkerntz.c

@@ -148,6 +148,8 @@ main(int argc, char *argv[])
 			return 0;
 	}
 
+	tzset();
+
 	mib[0] = CTL_MACHDEP;
 	mib[1] = CPU_ADJKERNTZ;
 	len = sizeof(kern_offset);