tree-wide: use TAKE_PTR() and TAKE_FD() macros

src/basic/time-util.c

@@ -1283,8 +1283,7 @@ int get_timezones(char ***ret) {
         } else if (errno != ENOENT)
                 return -errno;
 
-        *ret = zones;
-        zones = NULL;
+        *ret = TAKE_PTR(zones);
 
         return 0;
 }