Revert "Bug #66481 Segfaults on session_name()"

This reverts commit 5662ffb.

Author: laruence

ext/session/session.c

@@ -617,13 +617,6 @@ static PHP_INI_MH(OnUpdateSaveDir) /* {{{ */
 
 static PHP_INI_MH(OnUpdateName) /* {{{ */
 {
-	/* Don't accept a blank session name from php.ini or -d session.name= */
-	if (!PG(modules_activated) && !new_value_length) {
-		/* Force the default value. */
-		new_value = "PHPSESSID";
-		new_value_length = 9;
-	}
-
 	/* Numeric session.name won't work at all */
 	if (PG(modules_activated) &&
 		(!new_value_length || is_numeric_string(new_value, new_value_length, NULL, NULL, 0))) {