style: remove trailing whitespace

Result of running 'hg m5style --skip-all --fix-white -a'.

src/python/m5/util/__init__.py

@@ -174,7 +174,7 @@ def readCommand(cmd, **kwargs):
 
     no_exception = 'exception' in kwargs
     exception = kwargs.pop('exception', None)
-    
+
     kwargs.setdefault('shell', False)
     kwargs.setdefault('stdout', PIPE)
     kwargs.setdefault('stderr', STDOUT)

src/python/swig/event.i

@@ -57,11 +57,11 @@
             pyevent->incref();
         $self->schedule(event, when);
     }
-    
+
     void
     deschedule(Event *event)
     {
-        $self->deschedule(event); 
+        $self->deschedule(event);
 
         // Now that we're removing the python object from the event
         // queue, we need to decrement its reference count.