src: remove ParseIP() in cares_wrap.cc
This function is only used in one place where the result
argument is never nullptr
, so remove special handling of that case. Also, instead of returning magic values 0
/4
/6
and then later translating those into error/AF_INET
/AF_INET6
, use AF_INET
/AF_INET6
directly. Lastly, inline the function, which is simpler overall.