multi: Fix error handling in the SENDPROTOCONNECT state

If Curl_protocol_connect() returns an error code,
handle the error instead of switching to the next state.

Closes #3170

diff --git a/lib/multi.c b/lib/multi.c
index 7c691a1b84de29f6ab5eeab576a92e684bcba0a6..0db2a97308c64fede76b372a450ab1a363857177 100644 (file)
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1608,7 +1608,7 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
 
     case CURLM_STATE_SENDPROTOCONNECT:
       result = Curl_protocol_connect(data->easy_conn, &protocol_connect);
-      if(!protocol_connect)
+      if(!result && !protocol_connect)
         /* switch to waiting state */
         multistate(data, CURLM_STATE_PROTOCONNECT);
       else if(!result) {