crash in enumerateDevices()

[J-d-H]

There is a bug in enumerateDevices() on line 216 in serial.cpp.
If the System does not have serial ports str is still "" from the begining of the function and free(str) fails.

You can probably fix it with

if (strlen(str) > 0) str[strlen(str)-1] = '\0';
else return alloc_null();

value ret = alloc_string(str);
free(str);
return ret;