fix: Decompressor to return -1 when output doesn't fit

[Tabaie]

Description

Currently, when the output buffer d is not long enough to contain the decompressed stream, Decompress returns dLength = 0 which is seen as a valid output. This PR changes that to -1 which in any cryptographic prime-order field is so large it cannot be confused with a valid output length.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How has this been tested?

TestOutBufTooShort

How has this been benchmarked?

No benchmark. Performance impact expected to be negligible.

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I did not modify files generated from templates
• golangci-lint does not output errors locally
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[AlexandreBelling]

Looking good to me :)