UPSTREAM: f2fs: clear PageError on writepage - part 2

This patch clears PageError in some pages tagged by read path, but when we
write the pages with valid contents, writepage should clear the bit likewise
ext4.

Change-Id: I434b22132f29f7243ab9170296a6e0b52e40701d
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit f453147e)