ext4: Use nr_to_write directly in mpage_prepare_extent_to_map()

When looking up extent of pages to map in mpage_prepare_extent_to_map()
we count how many pages we still need to find in a copy of
wbc->nr_to_write counter. With more complex page handling for
data=journal mode, it will be easier to use wbc->nr_to_write directly so
that we don't forget to carry over changes back to nr_to_write counter.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230228051319.4085470-3-tytso@mit.edu

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