dh-gex: Add missing goto error

Jakub Jelenrequested to merge
jjelen/libssh-mirror:missing-goto into master

The code should not be reachable as this condition is already tesed by making sure the modulus length is larger than DH_PMIN.

Originally reported by Saransh Rana.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • The project pipelines timeout is extended at least to 2 hours.

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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