Pull request 3: In Proxy.handleRequest, check error before dereferencing request

Merge in GO/gomitmproxy from stevevls-fix-segfault-on-untrusted-cert to master

Squashed commit of the following:

commit 65b016c
Author: Steve van Loben Sels <svanlobensels@rippling.com>
Date:   Fri Oct 20 12:03:41 2023 -0700

    In Proxy.handleRequest, check error before dereferencing request

    This fixes a segfault in the case where the caller does not trust the CA

Author: ameshkov

proxy.go

@@ -228,13 +228,12 @@ func (p *Proxy) handleLoop(ctx *Context) {
 // handleRequest reads an incoming request and processes it.
 func (p *Proxy) handleRequest(ctx *Context) (err error) {
 	origReq, err := p.readRequest(ctx)
-
-	defer log.OnCloserError(origReq.Body, log.DEBUG)
-
 	if err != nil {
 		return err
 	}
 
+	defer log.OnCloserError(origReq.Body, log.DEBUG)
+
 	session := newSession(ctx, origReq)
 	p.prepareRequest(origReq, session)
 	log.Debug("id=%s: handle request %s %s", session.ID(), origReq.Method, origReq.URL.String())