lib: refactor the type of funcs which have useless return and checks

Some internal functions always return CURLE_OK.

- Curl_http_proxy_get_destination() does that from bb4032a, (2 years
  ago) And the original inline code does not need to check the status.

- Curl_wildcard_init() does that from e60fe20. (8 years ago)

- Curl_initinfo() does that from a very beginning.

- Curl_pgrsSetDownloadCounter() did not have a return before 914e49b,
  ad051e1 recovered its content (2 years ago) but did not completely
  recovered the changes related to it.

- auth_digest_get_qop_values() does that from 676de7f.

This directly changes their type to void and cleaned the remaining
checks for their return value.

Closes #19386

lib/http_proxy.c

@@ -167,9 +167,9 @@ static CURLcode dynhds_add_custom(struct Curl_easy *data,
   return CURLE_OK;
 }
 
-CURLcode Curl_http_proxy_get_destination(struct Curl_cfilter *cf,
-                                         const char **phostname,
-                                         int *pport, bool *pipv6_ip)
+void Curl_http_proxy_get_destination(struct Curl_cfilter *cf,
+                                     const char **phostname,
+                                     int *pport, bool *pipv6_ip)
 {
   DEBUGASSERT(cf);
   DEBUGASSERT(cf->conn);
@@ -192,8 +192,6 @@ CURLcode Curl_http_proxy_get_destination(struct Curl_cfilter *cf,
     *pipv6_ip = (strchr(*phostname, ':') != NULL);
   else
     *pipv6_ip = cf->conn->bits.ipv6_ip;
-
-  return CURLE_OK;
 }
 
 struct cf_proxy_ctx {
@@ -214,9 +212,7 @@ CURLcode Curl_http_proxy_create_CONNECT(struct httpreq **preq,
   CURLcode result;
   struct httpreq *req = NULL;
 
-  result = Curl_http_proxy_get_destination(cf, &hostname, &port, &ipv6_ip);
-  if(result)
-    goto out;
+  Curl_http_proxy_get_destination(cf, &hostname, &port, &ipv6_ip);
 
   authority = curl_maprintf("%s%s%s:%d", ipv6_ip ? "[" : "", hostname,
                             ipv6_ip ?"]" : "", port);