pretransfer: init state.infilesize here, not in add_handle

... to properly support that options are set to the handle after it is
added to the multi handle.

Bug: http://curl.haxx.se/mail/lib-2015-06/0122.html
Reported-by: Stefan Bühler

lib/multi.c

@@ -402,11 +402,6 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
   /* Point to the multi's connection cache */
   data->state.conn_cache = &multi->conn_cache;
 
-  if(data->set.httpreq == HTTPREQ_PUT)
-    data->state.infilesize = data->set.filesize;
-  else
-    data->state.infilesize = data->set.postfieldsize;
-
   /* This adds the new entry at the 'end' of the doubly-linked circular
      list of SessionHandle structs to try and maintain a FIFO queue so
      the pipelined requests are in order. */

lib/transfer.c

@@ -1315,6 +1315,11 @@ CURLcode Curl_pretransfer(struct SessionHandle *data)
   Curl_safefree(data->info.wouldredirect);
   data->info.wouldredirect = NULL;
 
+  if(data->set.httpreq == HTTPREQ_PUT)
+    data->state.infilesize = data->set.filesize;
+  else
+    data->state.infilesize = data->set.postfieldsize;
+
   /* If there is a list of cookie files to read, do it now! */
   if(data->change.cookielist)
     Curl_cookie_loadfiles(data);