fixed bug in remap_files

ChangeLog

@@ -70,6 +70,7 @@
 	  incoming connection
 	* added more detailed instrumentation of the disk I/O thread
 
+	* fixed bug in torrent_info::remap_files
 	* fix python binding for wait_for_alert
 	* only apply privileged port filter to DHT-only peers
 

src/torrent_info.cpp

@@ -497,6 +497,8 @@ namespace libtorrent
 		if (m_files.total_size() != f.total_size()) return;
 		copy_on_write();
 		m_files = f;
+		m_files.set_num_pieces(m_orig_files->num_pieces());
+		m_files.set_piece_length(m_orig_files->piece_length());
 	}
 
 #ifndef TORRENT_NO_DEPRECATE