respect the SUSP offset from SP record

[codecov[bot]]

Codecov Report

Patch coverage: 86.58% and project coverage change: +1.74 :tada:

Comparison is base (7d7a089) 75.72% compared to head (0abec64) 77.47%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #33 +/- ## ========================================== + Coverage 75.72% 77.47% +1.74% ========================================== Files 4 5 +1 Lines 964 1123 +159 ========================================== + Hits 730 870 +140 - Misses 165 178 +13 - Partials 69 75 +6 ``` | [Impacted Files](https://app.codecov.io/gh/kdomanski/iso9660/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kamil+Doma%C5%84ski) | Coverage Δ | | |---|---|---| | [iso9660.go](https://app.codecov.io/gh/kdomanski/iso9660/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kamil+Doma%C5%84ski#diff-aXNvOTY2MC5nbw==) | `73.15% <ø> (ø)` | | | [image\_reader.go](https://app.codecov.io/gh/kdomanski/iso9660/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kamil+Doma%C5%84ski#diff-aW1hZ2VfcmVhZGVyLmdv) | `76.59% <77.77%> (+2.33%)` | :arrow_up: | | [susp.go](https://app.codecov.io/gh/kdomanski/iso9660/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kamil+Doma%C5%84ski#diff-c3VzcC5nbw==) | `89.91% <89.91%> (ø)` | |

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