BNetworkAddress: Close socket in ResolveForDestination.

It was closed on all the failure cases but not on the success one.
Found by Coverity.

src/kits/network/libnetapi/NetworkAddress.cpp

@@ -963,6 +963,7 @@ BNetworkAddress::ResolveForDestination(const BNetworkAddress& destination)
 	memcpy(&fAddress, route->source, sizeof(sockaddr_storage));
 	SetPort(port);
 
+	close(socket);
 	return B_OK;
 }