free(info.errors) leads to a assertion error on the heap.

On Windows it reads:

is_block_type_valid(header->_block_use).

Memory for info.errors is allocated in the osdi device dll
during the call to

      descr->setup_instance((void *)&handle, inst, model, temp,
                            connected_terminals, sim_params, &init_info);

(in fcn OSDIsetup(), line 254 of osdisetup.c).
Therefore ngspice is not the owner of this memory and thus cannot free it.

Fixes bug no. 803.

src/osdi/osdisetup.c

@@ -46,7 +46,6 @@ static int handle_init_info(OsdiInitInfo info, const OsdiDescriptor *descr) {
       printf("Unknown OSDO init error code %d!\n", err->code);
     }
   }
-  free(info.errors);
   errMsg = tprintf("%i errors occurred during initialization", info.num_errors);
   return (E_PRIVATE);
 }