urldata: remove 'void *protop' and create the union 'p'

... to avoid the use of 'void *' for the protocol specific structs done
per transfer.

Closes #6238

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index 381f98dc6..f8b2a0030 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2108,7 +2108,7 @@ static CURLcode setup_connection_internals(struct connectdata *conn)
 
 void Curl_free_request_state(struct Curl_easy *data)
 {
-  Curl_safefree(data->req.protop);
+  Curl_safefree(data->req.p.http);
   Curl_safefree(data->req.newurl);
 
 #ifndef CURL_DISABLE_DOH