[Toybox] [PATCH] date: silence gcc 13.2.

[enh]

The code is correct (and doesn't seem to bother clang), but gcc can't
tell that we don't touch old_tz unless we've touched new_tz (which _is_
guaranteed to be initialized).
---
 toys/posix/date.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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