use local rather than global var

inventory_provider/juniper.py

@@ -386,13 +386,12 @@ def load_routers_from_junosspace(config):
 
     def _derive_hostname(n):
         # TODO: ask ops if this name->hostname operation is valid
-        if name.endswith('geant.net'):
-            return name
-        m = re.match(r'^(.*?)(\.re\d+)?$', name)
+        if n.endswith('geant.net'):
+            return n
+        m = re.match(r'^(.*?)(\.re\d+)?$', n)
         if m:
             return m.group(1) + '.geant.net'
-        logger.error(
-            'unrecognized junosspace device name format :%s' % name)
+        logger.error(f'unrecognized junosspace device name format: "{n}"')
         return None
 
     for d in devices.xpath('//devices/device'):