clang-tidy: sync argument names in prototype and definition

Discovered with clang-tidy checker
`readability-inconsistent-declaration-parameter-name`.

Also:
- do not enforce the above because of inconsistencies still present
  between public API prototypes and definitions. (Also betwen man page
  protos, and man page examples, and other parts of the code, e.g.
  `easy` vs `curl` vs `d` vs `handle`) Perhaps subject for a future
  effort:
  https://github.com/curl/curl/actions/runs/22166472728/job/64094691653
- enable and fix `readability-named-parameter` where missing.

Refs:
https://clang.llvm.org/extra/clang-tidy/checks/readability/inconsistent-declaration-parameter-name.html
https://clang.llvm.org/extra/clang-tidy/checks/readability/named-parameter.html

Closes #20624

lib/ftp.c

@@ -168,8 +168,8 @@ static CURLcode ftp_nb_type(struct Curl_easy *data,
                             struct ftp_conn *ftpc,
                             struct FTP *ftp,
                             bool ascii, ftpstate newstate);
-static CURLcode getftpresponse(struct Curl_easy *data, size_t *nread,
-                               int *ftpcode);
+static CURLcode getftpresponse(struct Curl_easy *data, size_t *nreadp,
+                               int *ftpcodep);
 
 static void freedirs(struct ftp_conn *ftpc)
 {
@@ -629,7 +629,7 @@ static CURLcode ftp_readresp(struct Curl_easy *data,
  */
 static CURLcode getftpresponse(struct Curl_easy *data,
                                size_t *nreadp, /* return number of bytes
-                                                   read */
+                                                  read */
                                int *ftpcodep) /* return the ftp-code */
 {
   /*