jbd2: remove stale comment of update_t_max_wait

Commit 2d44292 ("jbd2: remove CONFIG_JBD2_DEBUG to update
t_max_wait") removed jbd2_journal_enable_debug, just remove stale comment
about jbd2_journal_enable_debug.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20250123155014.2097920-5-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/jbd2/transaction.c

@@ -113,12 +113,9 @@ static void jbd2_get_transaction(journal_t *journal,
  */
 
 /*
- * Update transaction's maximum wait time, if debugging is enabled.
- *
  * t_max_wait is carefully updated here with use of atomic compare exchange.
  * Note that there could be multiplre threads trying to do this simultaneously
  * hence using cmpxchg to avoid any use of locks in this case.
- * With this t_max_wait can be updated w/o enabling jbd2_journal_enable_debug.
  */
 static inline void update_t_max_wait(transaction_t *transaction,
 				     unsigned long ts)