git: a38c2f99f81c - main - tzcode: Fix early tz change detection

The branch main has been updated by des:

URL: https://cgit.FreeBSD.org/src/commit/?id=a38c2f99f81c2fc35c8ca209931c1c46e3e81023

commit a38c2f99f81c2fc35c8ca209931c1c46e3e81023
Author:     Dag-Erling Smørgrav <des@FreeBSD.org>
AuthorDate: 2025-11-02 13:51:42 +0000
Commit:     Dag-Erling Smørgrav <des@FreeBSD.org>
CommitDate: 2025-11-02 13:51:42 +0000

    tzcode: Fix early tz change detection
    
    Assume tzdata is not fresh if last_checked is zero, as comparing the
    current time to last_checked less than __tz_change_interval after boot
    may produce a false negative.
    
    While here, invert the return value from tzdata_is_fresh() to better
    match its new name (it was previously called recheck_tzdata(), so zero
    for fresh and non-zero for stale made sense, but it doesn't now).
    
    PR:             269207
    MFC after:      3 days
    Reviewed by:    imp
    Differential Revision:  https://reviews.freebsd.org/D53502
---
 contrib/tzcode/localtime.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/contrib/tzcode/localtime.c b/contrib/tzcode/localtime.c
index 1668475ea646..58099d234e2b 100644
--- a/contrib/tzcode/localtime.c
+++ b/contrib/tzcode/localtime.c
@@ -1583,15 +1583,15 @@ tzdata_is_fresh(void)
 	struct timespec now;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &now) < 0)
-		return 0;
+		return 1;
 
-	if ((now.tv_sec - last_checked >= __tz_change_interval) ||
-	    (last_checked > now.tv_sec)) {
+	if (last_checked == 0 || last_checked > now.tv_sec ||
+	    now.tv_sec - last_checked >= __tz_change_interval) {
 		last_checked = now.tv_sec;
-		return 1;
+		return 0;
 	}
 
-	return 0;
+	return 1;
 }
 #endif /* DETECT_TZ_CHANGES */
 
@@ -1642,7 +1642,7 @@ tzset_unlocked_name(char const *name)
       ? lcl_is_set < 0
       : 0 < lcl_is_set && strcmp(lcl_TZname, name) == 0)
 #ifdef DETECT_TZ_CHANGES
-    if (tzdata_is_fresh() == 0)
+    if (tzdata_is_fresh())
 #endif /* DETECT_TZ_CHANGES */
     return;
 # ifdef ALL_STATE