make sure throughput display gets updated even if progress doesn't move

Currently the progress/throughput display update happens only through
display_progress().  If the progress based on object count remains
unchanged because a large object is being received, the latest throughput
won't be displayed.  The display update should occur through
display_throughput() as well.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

progress.c

@@ -160,6 +160,9 @@ void display_throughput(struct progress *progress, unsigned long n)
 		tp->last_misecs[tp->idx] = misecs;
 		tp->idx = (tp->idx + 1) % TP_IDX_MAX;
 		tp->count = 0;
+
+		if (progress->last_value != -1 && progress_update)
+			display(progress, progress->last_value, 0);
 	}
 }