Pylint tweaks for the global manipulation

Author: dastels

adafruit_logging.py

@@ -97,15 +97,15 @@ def emit(self, level, msg):
 logger_cache = dict()
 null_logger = None
 
-
+# pylint:disable=global-statement
 def getLogger(name):
-    global null_logger
     """Create or retrieve a logger by name.
 
     :param name: the name of the logger to create/retrieve None will cause the
                  NullLogger instance to be returned.
 
     """
+    global null_logger
     if not name or name == "":
         if not null_logger:
             null_logger = NullLogger()
@@ -116,6 +116,9 @@ def getLogger(name):
     return logger_cache[name]
 
 
+# pylint:enable=global-statement
+
+
 class Logger:
     """Provide a logging api."""