Shouldn't this line be null terminated?

Shouldn't this line be null terminated?
HostEnt := gethostbyname(MarshaledAString(TEncoding.UTF8.GetBytes(Name)));

class function TIPAddress.LookupName(const Name: string): TIPAddress;
var
HostEnt: PHostEnt;
begin
HostEnt := gethostbyname(MarshaledAString(TEncoding.UTF8.GetBytes(Name)));
FillChar(Result, SizeOf(Result), 0);
if HostEnt <> nil then
Result.FAddr.S_addr := PCardinal(HostEnt.h_addr_list^)^;
end;

For example...
HostEnt := gethostbyname(MarshaledAString(TEncoding.UTF8.GetBytes(Name + #0)));
or
HostEnt := gethostbyname(MarshaledAString(Utf8String(Name))); because the Utf8String is null terminated internally.

It appears it currently only works if you are lucky enough to have a zero in memory at the end, especially on the new Linux compiler. The System.Net.Socket units have a lot of great functionality that I wish I could use.