htp: remove user setup from request line callback

This used to be the first callback that was called, but its not anymore.

Codecov confirmed that this is no longer used and therefore not useful.

src/app-layer-htp.c

@@ -2310,15 +2310,9 @@ static int HTPCallbackRequestLine(htp_tx_t *tx)
         return HTP_OK;
 
     tx_ud = htp_tx_get_user_data(tx);
-    if (likely(tx_ud == NULL)) {
-        tx_ud = HTPMalloc(sizeof(*tx_ud));
     if (unlikely(tx_ud == NULL)) {
-            bstr_free(request_uri_normalized);
         return HTP_OK;
     }
-        memset(tx_ud, 0, sizeof(*tx_ud));
-        htp_tx_set_user_data(tx, tx_ud);
-    }
     if (unlikely(tx_ud->request_uri_normalized != NULL))
         bstr_free(tx_ud->request_uri_normalized);
     tx_ud->request_uri_normalized = request_uri_normalized;