telnet: make printsub require another byte input

Reported in Joshua's sarif data

Closes #18618

diff --git a/lib/telnet.c b/lib/telnet.c
index cc827c1b3e8a1684e611cd26ec22fc4c98455818..05e5ebe60cc78df7af905f6746c02c979d666dff 100644 (file)
--- a/lib/telnet.c
+++ b/lib/telnet.c
@@ -713,7 +713,7 @@ static void printsub(struct Curl_easy *data,
       else /* bad input */
         return;
     }
-    if(length < 1) {
+    if(length <= 1) {
       infof(data, "(Empty suboption?)");
       return;
     }