fix regression in torrent size check

src/torrent_info.cpp

@@ -1013,7 +1013,8 @@ namespace {
 		// we want this division to round upwards, that's why we have the
 		// extra addition
 
-		if (files.total_size() >= std::numeric_limits<int>::max()
+		if (files.total_size() >=
+			(std::numeric_limits<std::int64_t>::max() / files.piece_length())
 			- files.piece_length())
 		{
 			ec = errors::too_many_pieces_in_torrent;

test/test_torrent_info.cpp

@@ -126,6 +126,7 @@ static test_torrent_t test_torrents[] =
 	{ "unordered.torrent" },
 	{ "symlink_zero_size.torrent" },
 	{ "pad_file_no_path.torrent" },
+	{ "large.torrent" },
 };
 
 struct test_failing_torrent_t