btrfs: use list_for_each_entry_safe in free_reloc_roots
The function always works on a local copy of the reloc root list, which cannot be modified outside of it so using list_for_each_entry is fine. Additionally the macro handles empty lists so drop list_empty checks of callers. No semantic changes. Reviewed-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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