[6.8.0] virDomainSnapshot class init - undefined variable

It is not possible to create snapshot because during the virDomainSnapshot class initialization there is an undefined variable.

See traceback:

Traceback (most recent call last):
File "/tmp/scap-security-guide-0.1.53/tests/ssg_test_suite/virt.py", line 38, in create
    self.CREATE_FLAGS)
  File "/usr/local/lib64/python3.6/site-packages/libvirt.py", line 2830, in snapshotCreateXML
    __tmp = virDomainSnapshot(self, _obj=ret)
  File "/usr/local/lib64/python3.6/site-packages/libvirt.py", line 6628, in __init__
    self._dom = dom
NameError: name 'dom' is not defined

6.7.0:

class virDomainSnapshot(object):
    def __init__(self, dom, _obj=None):
        self._dom = dom
        self._conn = dom.connect()
        if type(_obj).__name__ not in ["PyCapsule", "PyCObject"]:
            raise Exception("Expected a wrapped C Object but got %s" % type(_obj))
        self._o = _obj

6.8.0:

class virDomainSnapshot(object):
    def __init__(self, net, _obj=None):
        self._dom = dom
        self._conn = dom.connect()
        if type(_obj).__name__ not in ["PyCapsule", "PyCObject"]:
            raise Exception("Expected a wrapped C Object but got %s" % type(_obj))
        self._o = _obj

Parameter name has been changed but the code in initialization did not.