tty: tty_io: Remove the repeated word 'can'

Remove the repeated word 'can' following advice of checkpatch.pl
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Link: https://lore.kernel.org/r/1620811585-18582-12-git-send-email-tanxiaofei@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_io.c

@@ -1155,7 +1155,7 @@ ssize_t redirected_tty_write(struct kiocb *iocb, struct iov_iter *iter)
 	spin_unlock(&redirect_lock);
 
 	/*
-	 * We know the redirected tty is just another tty, we can can
+	 * We know the redirected tty is just another tty, we can
 	 * call file_tty_write() directly with that file pointer.
 	 */
 	if (p) {