Simplify Ctrl+C signal handling

handler/app.py

@@ -23,11 +23,7 @@ from money import Money
 init_map = None
 
 
-def handler(sig, frame):
+def cleanup(sig, frame):
-    cleanup()
-
-
-def cleanup():
     if init_map:
         try:
             init_map["tx"].lc_es_checks.stop()
@@ -38,7 +34,7 @@ def cleanup():
     reactor.stop()
 
 
-signal(SIGINT, handler)  # Handle Ctrl-C and run the cleanup routine
+signal(SIGINT, cleanup)  # Handle Ctrl-C and run the cleanup routine
 
 
 def convert(data):