Fix GH-16385: Unexpected null returned by session_set_cookie_params

Two issues:
1) The check happened before ZPP checks
2) The `return;` statement caused NULL to be returned while th

Fix GH-16385: Unexpected null returned by session_set_cookie_params

Two issues:
1) The check happened before ZPP checks
2) The `return;` statement caused NULL to be returned while this
function can only return booleans. An exception seems not acceptable
in stable versions, but a warning may do.

Closes GH-16386.

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