Line numbers don't match up

I have the following hsc file. [Pcre2.hsc.txt](https://github.com/haskell/hsc2hs/files/2707789/Pcre2.hsc.txt)

I get in the generated .hs file

```
{-# LINE 81 "Pcre2.hsc" #-}
data C'pcre2_callout_block_8 = C'pcre2_callout_block_8{
c'pcre2_callout_block_8'version :: CUInt,
c'pcre2_callout_block_8'callout_number :: CUInt,
c'pcre2_callout_block_8'capture_top :: CUInt,
c'pcre2_callout_block_8'capture_last :: CUInt,
c'pcre2_callout_block_8'offset_vector :: Ptr CSize,
c'pcre2_callout_block_8'mark :: C'PCRE2_SPTR8,
c'pcre2_callout_block_8'subject :: C'PCRE2_SPTR8,
c'pcre2_callout_block_8'subject_length :: CSize,
c'pcre2_callout_block_8'start_match :: CSize,
c'pcre2_callout_block_8'current_position :: CSize,
c'pcre2_callout_block_8'pattern_position :: CSize,
c'pcre2_callout_block_8'next_item_length :: CSize,
c'pcre2_callout_block_8'callout_string_offset :: CSize,
c'pcre2_callout_block_8'callout_string_length :: CSize,
c'pcre2_callout_block_8'callout_string :: C'PCRE2_SPTR8,
c'pcre2_callout_block_8'callout_flags :: CUInt
} deriving (Eq,Show)
```

But this should be about line 46