http2: call done_sending on end of upload

To make sure a HTTP/2 stream registers the end of stream.

Bug #4043 made me find this problem but this fix doesn't correct the
reported issue.

Closes #4068

lib/http.c

@@ -3511,8 +3511,10 @@ CURLcode Curl_http_readwrite_headers(struct Curl_easy *data,
               else {
                 infof(data, "HTTP error before end of send, stop sending\n");
                 streamclose(conn, "Stop sending data before everything sent");
+                result = Curl_done_sending(conn, k);
+                if(result)
+                  return result;
                 k->upload_done = TRUE;
-                k->keepon &= ~KEEP_SEND; /* don't send */
                 if(data->state.expect100header)
                   k->exp100 = EXP100_FAILED;
               }

lib/http2.c

@@ -1880,7 +1880,11 @@ static ssize_t http2_send(struct connectdata *conn, int sockindex,
        are going to send or sending request body in DATA frame */
     stream->upload_mem = mem;
     stream->upload_len = len;
-    nghttp2_session_resume_data(h2, stream->stream_id);
+    rv = nghttp2_session_resume_data(h2, stream->stream_id);
+    if(nghttp2_is_fatal(rv)) {
+      *err = CURLE_SEND_ERROR;
+      return -1;
+    }
     rv = h2_session_send(conn->data, h2);
     if(nghttp2_is_fatal(rv)) {
       *err = CURLE_SEND_ERROR;

lib/transfer.c

@@ -937,8 +937,8 @@ static CURLcode readwrite_data(struct Curl_easy *data,
   return CURLE_OK;
 }
 
-static CURLcode done_sending(struct connectdata *conn,
-                             struct SingleRequest *k)
+CURLcode Curl_done_sending(struct connectdata *conn,
+                           struct SingleRequest *k)
 {
   k->keepon &= ~KEEP_SEND; /* we're done writing */
 
@@ -1046,7 +1046,7 @@ static CURLcode readwrite_upload(struct Curl_easy *data,
         break;
       }
       if(nread <= 0) {
-        result = done_sending(conn, k);
+        result = Curl_done_sending(conn, k);
         if(result)
           return result;
         break;
@@ -1164,7 +1164,7 @@ static CURLcode readwrite_upload(struct Curl_easy *data,
       k->upload_present = 0; /* no more bytes left */
 
       if(k->upload_done) {
-        result = done_sending(conn, k);
+        result = Curl_done_sending(conn, k);
         if(result)
           return result;
       }

lib/transfer.h

@@ -57,6 +57,9 @@ CURLcode Curl_retry_request(struct connectdata *conn, char **url);
 bool Curl_meets_timecondition(struct Curl_easy *data, time_t timeofdoc);
 CURLcode Curl_get_upload_buffer(struct Curl_easy *data);
 
+CURLcode Curl_done_sending(struct connectdata *conn,
+                           struct SingleRequest *k);
+
 /* This sets up a forthcoming transfer */
 void
 Curl_setup_transfer (struct Curl_easy *data,