Curl_pgrsDone: return int and acknowledge return code

Since Curl_pgrsDone() itself calls Curl_pgrsUpdate() which may return an
abort instruction or similar we need to return that info back and
subsequently properly handle return codes from Curl_pgrsDone() where
used.

(Spotted by a Coverity scan)

lib/progress.c

@@ -131,11 +131,14 @@ static char *max5data(curl_off_t bytes, char *max5)
 
 */
 
-void Curl_pgrsDone(struct connectdata *conn)
+int Curl_pgrsDone(struct connectdata *conn)
 {
+  int rc;
   struct SessionHandle *data = conn->data;
   data->progress.lastshow=0;
-  Curl_pgrsUpdate(conn); /* the final (forced) update */
+  rc = Curl_pgrsUpdate(conn); /* the final (forced) update */
+  if(rc)
+    return rc;
 
   if(!(data->progress.flags & PGRS_HIDE) &&
      !data->progress.callback)
@@ -144,6 +147,7 @@ void Curl_pgrsDone(struct connectdata *conn)
     fprintf(data->set.err, "\n");
 
   data->progress.speeder_c = 0; /* reset the progress meter display */
+  return 0;
 }
 
 /* reset all times except redirect, and reset the known transfer sizes */
@@ -241,6 +245,10 @@ void Curl_pgrsSetUploadSize(struct SessionHandle *data, curl_off_t size)
     data->progress.flags &= ~PGRS_UL_SIZE_KNOWN;
 }
 
+/*
+ * Curl_pgrsUpdate() returns 0 for success or the value returned by the
+ * progress callback!
+ */
 int Curl_pgrsUpdate(struct connectdata *conn)
 {
   struct timeval now;

lib/progress.h

@@ -39,7 +39,7 @@ typedef enum {
   TIMER_LAST /* must be last */
 } timerid;
 
-void Curl_pgrsDone(struct connectdata *);
+int Curl_pgrsDone(struct connectdata *);
 void Curl_pgrsStartNow(struct SessionHandle *data);
 void Curl_pgrsSetDownloadSize(struct SessionHandle *data, curl_off_t size);
 void Curl_pgrsSetUploadSize(struct SessionHandle *data, curl_off_t size);

lib/ssh.c

@@ -2820,7 +2820,8 @@ static CURLcode ssh_done(struct connectdata *conn, CURLcode status)
 
   if(sftp_scp)
     Curl_safefree(sftp_scp->path);
-  Curl_pgrsDone(conn);
+  if(Curl_pgrsDone(conn))
+    return CURLE_ABORTED_BY_CALLBACK;
 
   conn->data->req.keepon = 0; /* clear all bits */
   return result;

lib/tftp.c

@@ -1036,7 +1036,8 @@ static CURLcode tftp_done(struct connectdata *conn, CURLcode status,
   (void)status; /* unused */
   (void)premature; /* not used */
 
-  Curl_pgrsDone(conn);
+  if(Curl_pgrsDone(conn))
+    return CURLE_ABORTED_BY_CALLBACK;
 
   /* If we have encountered an error */
   code = tftp_translate_code(state->error);

lib/url.c

@@ -5379,7 +5379,8 @@ CURLcode Curl_done(struct connectdata **connp,
   else
     result = CURLE_OK;
 
-  Curl_pgrsDone(conn); /* done with the operation */
+  if(Curl_pgrsDone(conn) && !result)
+    result = CURLE_ABORTED_BY_CALLBACK;
 
   /* if the transfer was completed in a paused state there can be buffered
      data left to write and then kill */