use syscallrecord structs in watchdog
use syscallrecord structs in mkcall
use syscallrecord structs in generic sanitise
remove call param from handle_arg_iovec

we can get it from the syscallrec
call numbers are always ints
remove passing call number around to handle_arg_address & find_previous_arg_address

just read it from the syscallrec
handle_arg_sockaddr doesn't need the call arg

get it from the syscallrec instead