A transfer timeout could result in an error message such as "Operation
timed out after 3000 milliseconds with 19 bytes of -1 received". This
patch removes the non-sensical "of -1" when the size of the transfer
is unknown, mirroring the logic in lib/transfer.c

---
 lib/multi.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/lib/multi.c b/lib/multi.c
index cab3030..84792ec 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -985,11 +985,19 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
                 Curl_tvdiff(now, data->progress.t_startsingle));
         else {
           k = &data->req;
-          failf(data, "Operation timed out after %ld milliseconds with %"
-                CURL_FORMAT_CURL_OFF_T " out of %"
-                CURL_FORMAT_CURL_OFF_T " bytes received",
-                Curl_tvdiff(now, data->progress.t_startsingle), k->bytecount,
-                k->size);
+          if(k->size != -1) {
+            failf(data, "Operation timed out after %ld milliseconds with %"
+                  CURL_FORMAT_CURL_OFF_T " out of %"
+                  CURL_FORMAT_CURL_OFF_T " bytes received",
+                  Curl_tvdiff(k->now, data->progress.t_startsingle),
+                  k->bytecount, k->size);
+          }
+          else {
+            failf(data, "Operation timed out after %ld milliseconds with %"
+                  CURL_FORMAT_CURL_OFF_T " bytes received",
+                  Curl_tvdiff(now, data->progress.t_startsingle),
+		  k->bytecount);
+          }
         }
 
         /* Force the connection closed because the server could continue to
-- 
1.7.1
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