OS400/ccsidcurl: replace use of Curl_vsetopt

(and make the code style comply)

Fixes #3833

packages/OS400/ccsidcurl.c

@@ -1305,9 +1305,12 @@ curl_easy_setopt_ccsid(CURL * curl, CURLoption tag, ...)
 
   case CURLOPT_ERRORBUFFER:                     /* This is an output buffer. */
   default:
-    result = Curl_vsetopt(data, tag, arg);
+  {
+    long val = va_arg(arg, long);
+    result = curl_easy_setopt(curl, tag, val);
     break;
   }
+  }
 
   va_end(arg);
   return result;