ext4: return correct wbc.nr_to_write in ext4_da_writepages

ext4: return correct wbc.nr_to_write in ext4_da_writepages

commit 2faf2e19dd0e060eeb32442858ef495ac3083277 upstream (as of v2.6.33-rc3)

When ext4_da_writepages increases the nr_to_write in writeback_control
then it must always re-base the return value.  Originally there was a
(misguided) attempt prevent wbc.nr_to_write from going negative.  In
fact, it's necessary to allow nr_to_write to be negative so that
wb_writeback() can correctly calculate how many pages were actually
written.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>