Initialize tzcode early.

An explicit tzset() call is usually not needed as it happens implicitly
the first time we call localtime() or mktime(), but in some cases
(sandboxing, chroot) this may be too late.

Author: dag-erling

tcpdump.c

@@ -1575,6 +1575,13 @@ main(int argc, char **argv)
 	if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 		error("%s", ebuf);
 
+	/*
+	 * An explicit tzset() call is usually not needed as it happens
+	 * implicitly the first time we call localtime() or mktime(),
+	 * but in some cases (sandboxing, chroot) this may be too late.
+	 */
+	tzset();
+
 	while (
 	    (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
 		switch (op) {