btrfs: return ENOMEM if path allocation fails in btrfs_cross_ref_exist
The error code does not match the reason of failure and may confuse the callers. Signed-off-by: NSu Yue <suy.fnst@cn.fujitsu.com> Reviewed-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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