QSslContext - do a little cleanup (OpenSSL)

1. Remove a useless forward declaration of a non-existing class.
2. Simplify the cipher filtering.
3. A missing private key (when local cert is present) found
   by the Qt, not OpenSSL, so no need in asking OpenSSL for errors
   in  queue.
3. Fix a potential double-free (for opaque keys).
4. read/write BIOs normally owned by SSL object, but if
   we fail to allocate any of them, we return early,
   potentially failing to free the one that was allocated.

Change-Id: Ifb52fbc9fd1a38f101bd7ff02e79b82d6eb7e5b0
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

0 files changed, 0 insertions, 0 deletions