btrfs: remove always true condition in btrfs_start_delalloc_roots
Following the rework in e076ab2a ("btrfs: shrink delalloc pages instead of full inodes") the nr variable is no longer passed by reference to start_delalloc_inodes hence it cannot change. Additionally we are always guaranteed for it to be positive number hence it's redundant to have it as a condition in the loop. Simply remove that usage. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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