python-lvm: seg. fault in liblvm_lvm_percent_to_float

The first parameter needs to be present even if it isn't being
used, otherwise the one any only parameter we get is null
which causes PyArg_ParseTuple to seg. fault.

Signed-off-by: Tony Asleson <tasleson@redhat.com>

python/liblvm.c

@@ -153,7 +153,7 @@ liblvm_lvm_list_vg_uuids(void)
 }
 
 static PyObject *
-liblvm_lvm_percent_to_float(PyObject *arg)
+liblvm_lvm_percent_to_float(PyObject *self, PyObject *arg)
 {
 	double converted;
 	int percent;