If rc is null, assume that a timeout happened. Fixes #2484 (#2485)

lib/ansible/modules/extras/commands/expect.py

@@ -214,7 +214,7 @@ def main():
     if out is None:
         out = ''
 
-    module.exit_json(
+    ret = dict(
         cmd=args,
         stdout=out.rstrip('\r\n'),
         rc=rc,
@@ -224,6 +224,12 @@ def main():
         changed=True,
     )
 
+    if rc:
+        module.exit_json(**ret)
+    else:
+        ret['msg'] = 'command exceeded timeout'
+        module.fail_json(**ret)
+
 # import module snippets
 from ansible.module_utils.basic import *