"ssl_bump none" mode crashes squid

"ssl_bump none" mode crashes squid

After r13324 patch the SBuf argument of the ConnStateData::handleReadData member
is used only to check if ConnStateData::In::buf is correctly filled with read
data. ConnStateData::handleReadData considers that the data already written
in ConnStateData::in.buf and checks if the passed Sbuf argument is the
ConnStateData::in.buf:

bool ConnStateData::handleReadData(SBuf *buf)
{
   assert(buf == &in.buf);
   .....

The httpsSslBumpAccessCheckDone function needs to write the CONNECT request
generated internally to force tunnel mode, in ConnStateData::In::buf and then
call ConnStateData::handleReadData method.