[NET] NetDll___WSAFDIsSet: Fixed incorrect endianness of fd_count

Plus: limit it to 64 entries
Thanks to Bo98 for pointing that out

Author: Gliniak

src/xenia/kernel/xam/xam_net.cc

@@ -1017,7 +1017,9 @@ DECLARE_XAM_EXPORT1(NetDll_sendto, kNetworking, kImplemented);
 
 dword_result_t NetDll___WSAFDIsSet_entry(dword_t socket_handle,
                                          pointer_t<x_fd_set> fd_set) {
-  for (uint32_t i = 0; i < fd_set->fd_count.value; i++) {
+  const uint8_t max_fd_count =
+      std::min((uint32_t)fd_set->fd_count, uint32_t(64));
+  for (uint8_t i = 0; i < max_fd_count; i++) {
     if (fd_set->fd_array[i] == socket_handle) {
       return 1;
     }