Merge remote-tracking branch 'qubesos/pr/224'

* qubesos/pr/224:
  Fix error on non ASCII PCI IDs upon qvm-device list

Fixed code style.

qubes/ext/pci.py

@@ -42,7 +42,8 @@ def load_pci_classes():
     #       subclass        subclass_name           <-- single tab
     #               prog-if  prog-if_name   <-- two tabs
     result = {}
-    with open('/usr/share/hwdata/pci.ids') as pciids:
+    with open('/usr/share/hwdata/pci.ids',
+            encoding='utf-8', errors='ignore') as pciids:
         class_id = None
         subclass_id = None
         for line in pciids.readlines():