btrfs: calculate physical_end using dev_extent_len directly in scrub_stripe()
The variable @physical_end is the exclusive stripe end, currently it's calculated using @physical + @dev_extent_len / map->stripe_len * map->stripe_len. And since at allocation time we ensured dev_extent_len is stripe_len aligned, the result is the same as @physical + @dev_extent_len. So this patch will just assign @physical and @physical_end early, without using @nstripes. This is especially helpful for any possible out: label user, as now we only need to initialize @offset before going to out: label. Since we're here, also make @physical_end constant. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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