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/telnet.c

@@ -1599,9 +1599,8 @@ static CURLcode telnet_do(struct Curl_easy *data, bool *done)
         }
 
         total_dl += nread;
-        result = Curl_pgrsSetDownloadCounter(data, total_dl);
-        if(!result)
-          result = telrcv(data, tn, (unsigned char *)buffer, nread);
+        Curl_pgrsSetDownloadCounter(data, total_dl);
+        result = telrcv(data, tn, (unsigned char *)buffer, nread);
         if(result) {
           keepon = FALSE;
           break;