findforwards: Don't compare array to NULL as this is always true.
log_client_name: Remove MASK_IP case.

The MASK_IP case in log_client_name() was broken (because of a missing
break, it behaved as HIDE_IP). However, log_client_name() with MASK_IP
does not make sense anyway and is not used.
sslproc: Add missing break, still allowing zlib when ssl cannot be set up.
commio: Explicitly ignore return value from setsockopt(TCP_DEFER_ACCEPT).
commio: Properly zero a struct msghdr.

This bug is probably not noticeable because all specified fields are
initialized later.