btrfs: delayed-ref: extract find_first_ref_head from find_ref_head
The find_ref_head shouldn't return the first entry even if no exact match is found. So move the hidden behavior to higher level. Besides, remove the useless local variables in the btrfs_select_ref_head. Reviewed-by:Nikolay Borisov <nborisov@suse.com> Signed-off-by:
Lu Fengqi <lufq.fnst@cn.fujitsu.com> [ reformat comment ] Signed-off-by:
David Sterba <dsterba@suse.com>
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5ce55557
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