btrfs: scrub: clean up temporary page variables in scrub_checksum_data

Add proper variable for the scrub page and use it instead of repeatedly
dereferencing the other structures.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-05-29 16:20:35 +02:00
commit d41ebef200