python3: Allow unicode strings as arg to get_interfaces_info

Going along with the previous "s*" change, allow the function to take
either a bytestring or a string. Otherwise .get_interfaces_info(b"eth1")
works on python3 but .get_interfaces_info("eth1") doesn't.

Signed-off-by: Andy Grover <agrover@redhat.com>

Author: Andy Grover

python-ethtool/ethtool.c

@@ -223,6 +223,12 @@ static PyObject *get_interfaces_info(PyObject *self __unused, PyObject *args) {
 			fetch_devs_len = 1;
 			fetch_devs = calloc(1, sizeof(char *));
 			fetch_devs[0] = PyBytes_AsString(inargs);
+#if PY_MAJOR_VERSION >= 3
+		} else if( PyUnicode_Check(inargs) ) { /* Input argument is just a ustring */
+			fetch_devs_len = 1;
+			fetch_devs = calloc(1, sizeof(char *));
+			fetch_devs[0] = PyUnicode_AsUTF8(inargs);
+#endif
 		} else if( PyTuple_Check(inargs) ) { /* Input argument is a tuple list with devices */
 			int j = 0;