btrfs: simplify lookup_data_extent()
After returning if ret <= 0 we know that ret > 0. No need to check it. Signed-off-by:Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by:
Qu Wenruo <wqu@suse.com> Reviewed-by: Anand Jain <anand.jain>
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