windows: fix regression when cancelling getaddrinfo

The req->addrinfow field contains the hints in that case, so we must not
free it.

This regression was introduced in f2bb8d3 by yours truly.

PR-URL: https://github.com/libuv/libuv/pull/171
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

src/win/getaddrinfo.c

@@ -201,13 +201,13 @@ static void uv__getaddrinfo_done(struct uv__work* w, int status) {
     }
   }
 
-complete:
   /* return memory to system */
   if (req->addrinfow != NULL) {
     FreeAddrInfoW(req->addrinfow);
     req->addrinfow = NULL;
   }
 
+complete:
   uv__req_unregister(req->loop, req);
 
   /* finally do callback with converted result */