[gnutls-devel] GnuTLS | _gnutls_alt_name_assign_virt_type: Fix memory leak (!2138)

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Tim Rühsen created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2138

Branches: rockdaboot/memleak-gnutls_alt_name_assign_virt_type to master
Author: Tim Rühsen

* _gnutls_alt_name_assign_virt_type: Fix memory leak

Signed-off-by: Tim Rühsen <tim.ruehsen at gmx.de>

## Short explanation
`_gnutls_alt_name_assign_virt_type()` takes ownership of `othername_oid` in case of success.  
The callers free `othername_oid` in case of error.

But this isn't true for cases where `type > GNUTLS_SAN_MAX` - `othername_oid` isn't consumed nor freed.

This MR frees `othername_oid` in the success case and when `type > GNUTLS_SAN_MAX`.

## Checklist
 * [x] 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 / NEWS entry present (for non-trivial changes)

## 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 `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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