[gnutls-devel] GnuTLS | bad_certificate instead of decode_error alert in compressed certificate (#1584)

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George Pantelakis created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1584



## Description of problem:
When we send a compressed certificate message and we have additional bytes at the begging or end of the message that is not reflected in the compressed_certificate_message size then we get a bad_certificate alert instead of a decode_error alert.

## Version of gnutls used:
gnutls-3.8.7

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
RHEL and Fedora

## How reproducible:
Always

Steps to Reproduce:

 * Run https://github.com/tlsfuzzer/tlsfuzzer/blob/master/scripts/test-tls13-client-certificate-compression.py against an GnuTLS server.

## Actual results:
Tests "Additional bytes, *" from test-tls13-client-certificate-compression.py fail

## Expected results:
Tests "Additional bytes, *" from test-tls13-client-certificate-compression.py will pass

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