Otherwise the closecb is called when the connection is closed/freed during
deinit, and this happens in the HTTP cleanup after the DAAP and DACP cleanups
have run, leading to spurious "struct update_request not found" messages.
Try to be a bit more strict about integer types, use off_t or int64_t for
file size and file offsets.
Replace safe_ato*() by safe_atoi32() and safe_atoi64(), fix integer types
at call sites to match.
