Merge branch 'cc/upload-pack-data'

Code clean-up. * cc/upload-pack-data: upload-pack: use upload_pack_data fields in receive_needs() upload-pack: pass upload_pack_data to create_pack_file() upload-pack: remove static variable 'stateless_rpc' upload-pack: pass upload_pack_data to check_non_tip() upload-pack: pass upload_pack_data to send_ref() upload-pack: move symref to upload_pack_data upload-pack: use upload_pack_data writer in receive_needs() upload-pack: pass upload_pack_data to receive_needs() upload-pack: pass upload_pack_data to get_common_commits() upload-pack: use 'struct upload_pack_data' in upload_pack() upload-pack: move 'struct upload_pack_data' around upload-pack: move {want,have}_obj to upload_pack_data upload-pack: remove unused 'wants' from upload_pack_data