getinfo: HTTP CONNECT code not reset between transfers

httpproxycode is not reset in Curl_initinfo, so a 407 is not reset even
if curl_easy_reset is called between transfers.

Bug: http://curl.haxx.se/bug/view.cgi?id=1380

lib/getinfo.c

@@ -53,6 +53,7 @@ CURLcode Curl_initinfo(struct SessionHandle *data)
   pro->t_redirect = 0;
 
   info->httpcode = 0;
+  info->httpproxycode = 0;
   info->httpversion = 0;
   info->filetime = -1; /* -1 is an illegal time and thus means unknown */
   info->timecond = FALSE;