Try an explicit close on init failure

gpiozero/devices.py

@@ -315,6 +315,7 @@ class CompositeDevice(Device):
         self._named = frozendict({})
         self._namedtuple = None
         self._order = kwargs.pop('_order', None)
+        try:
             if self._order is None:
                 self._order = sorted(kwargs.keys())
             else:
@@ -329,6 +330,11 @@ class CompositeDevice(Device):
             self._named = frozendict(kwargs)
             self._namedtuple = namedtuple('%sValue' % self.__class__.__name__, chain(
                 ('device_%d' % i for i in range(len(args))), self._order))
+        except:
+            for dev in chain(args, kwargs.values()):
+                if isinstance(dev, Device):
+                    dev.close()
+            raise
         self._all = args + tuple(kwargs[v] for v in self._order)
         super(CompositeDevice, self).__init__()
 
@@ -376,6 +382,7 @@ class CompositeDevice(Device):
         if self._all:
             for device in self._all:
                 device.close()
+            self._all = ()
 
     @property
     def closed(self):