sdbus++: missing dictionary lookup for process func

Change-Id: Ib26352d4323f55ff418e446c76994ed212819f70
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/tools/sdbus++ b/tools/sdbus++
index a3ed715..e68685d 100755
--- a/tools/sdbus++
+++ b/tools/sdbus++
@@ -27,7 +27,7 @@
     lookup = mako.lookup.TemplateLookup(directories=[args.templatedir])
 
     instance = valid_types[args.typeName].load(args.item, args.rootdir)
-    function = getattr(instance, args.process)
+    function = getattr(instance, valid_processes[args.process])
     print(function(lookup))
 
 if __name__ == '__main__':