ext4: fix incorrect comment in ext4_bio_write_page()

Signed-off-by: Wang Jianjian <wangjianjian3@huawei.com>
Link: https://lore.kernel.org/r/20220520022255.2120576-1-wangjianjian3@huawei.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>