else
{
uschar *envtz = US getenv("TZ");
- if (envtz ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0 : timezone_string)
+ if (envtz
+ ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
+ : timezone_string != NULL
+ )
{
uschar **p = USS environ;
uschar **new;