btrfs: rename macro local variables that clash with other variables

Fix variable names in two macros where there's a local function variable
of the same name.  In subpage_calc_start_bit() it's in several callers,
in btrfs_abort_transaction() it's only in replace_file_extents().
Found by 'make W=2'.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>