Fix last time zone handling change.

* editfns.c (decode_time_zone): Return Lisp string instead.
All related users changed.

src/editfns.c

@@ -2065,15 +2065,13 @@ check_tm_member (Lisp_Object obj, int offset)
 
 /* Decode ZONE as a time zone specification.  */
 
-static const char *
+static Lisp_Object
 decode_time_zone (Lisp_Object zone)
 {
-  const char *tzstring = NULL;
-
   if (EQ (zone, Qt))
-    tzstring = "UTC0";
+    return build_string ("UTC0");
   else if (STRINGP (zone))
-    tzstring = SSDATA (zone);
+    return zone;
   else if (INTEGERP (zone))
     {
       static char const tzbuf_format[] = "XXX%s%"pI"d:%02d:%02d";
@@ -2081,13 +2079,11 @@ decode_time_zone (Lisp_Object zone)
       EMACS_INT abszone = eabs (XINT (zone)), zone_hr = abszone / (60 * 60);
       int zone_min = (abszone / 60) % 60, zone_sec = abszone % 60;
 
-      sprintf (tzbuf, tzbuf_format, &"-"[XINT (zone) < 0],
-	       zone_hr, zone_min, zone_sec);
-      tzstring = tzbuf;
+      return make_formatted_string (tzbuf, tzbuf_format, &"-"[XINT (zone) < 0],
+				    zone_hr, zone_min, zone_sec);
     }
   else
     xsignal2 (Qerror, build_string ("Invalid time zone specification"), zone);
-  return tzstring;
 }
 
 DEFUN ("encode-time", Fencode_time, Sencode_time, 6, MANY, 0,
@@ -2132,7 +2128,7 @@ usage: (encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)  */)
     value = mktime (&tm);
   else
     {
-      timezone_t tz = tzalloc (decode_time_zone (zone));
+      timezone_t tz = tzalloc (SSDATA (decode_time_zone (zone)));
       value = mktime_z (tz, &tm);
       tzfree (tz);
     }
@@ -2278,7 +2274,7 @@ variable `process-environment', whereas `set-time-zone-rule' affects
 only the former.  */)
   (Lisp_Object tz)
 {
-  const char *tzstring = NILP (tz) ? initial_tz : decode_time_zone (tz);
+  const char *tzstring = NILP (tz) ? initial_tz : SSDATA (decode_time_zone (tz));
 
   block_input ();
   set_time_zone_rule (tzstring);