Use void instead of do and return ()

src/ShellCheck/Analytics.hs

@@ -500,11 +500,10 @@ checkPipePitfalls _ (T_Pipeline id _ commands) = do
         for' ["ls", "xargs"] $
             \x -> warn x 2011 "Use 'find .. -print0 | xargs -0 ..' or 'find .. -exec .. +' to allow non-alphanumeric filenames."
         ]
-    unless didLs $ do
+    unless didLs $ void $
         for ["ls", "?"] $
             \(ls:_) -> unless (hasShortParameter 'N' (oversimplify ls)) $
                 info (getId ls) 2012 "Use find instead of ls to better handle non-alphanumeric filenames."
-        return ()
   where
     for l f =
         let indices = indexOfSublists l (map (headOrDefault "" . oversimplify) commands)