Misc minor cleanups.
diff --git a/tools/checkstack.py b/tools/checkstack.py
index 680c033..8eafa97 100755
--- a/tools/checkstack.py
+++ b/tools/checkstack.py
@@ -13,8 +13,8 @@
 import re
 
 # List of functions we can assume are never called.
-#IGNORE = ['screenc', 'BX_PANIC', '__dprintf']
-IGNORE = ['screenc', 'BX_PANIC']
+#IGNORE = ['BX_PANIC', '__dprintf']
+IGNORE = ['BX_PANIC']
 
 # Find out maximum stack usage for a function
 def calcmaxstack(funcs, funcaddr):