rm extra whitespace in python, per PEP8
diff --git a/scons-tools/substinfile.py b/scons-tools/substinfile.py
index ef18b4e..33e5de0 100644
--- a/scons-tools/substinfile.py
+++ b/scons-tools/substinfile.py
@@ -70,7 +70,7 @@
         return target, source
 
 ##    env.Append(TOOLS = 'substinfile')       # this should be automaticaly done by Scons ?!?
-    subst_action = SCons.Action.Action( subst_in_file, subst_in_file_string )
+    subst_action = SCons.Action.Action(subst_in_file, subst_in_file_string)
     env['BUILDERS']['SubstInFile'] = Builder(action=subst_action, emitter=subst_emitter)
 
 def exists(env):