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