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

src/tool_easysrc.h

@@ -39,7 +39,7 @@ extern int easysrc_mime_count;  /* Number of curl_mime variables */
 extern int easysrc_slist_count; /* Number of curl_slist variables */
 
 extern CURLcode easysrc_init(void);
-extern CURLcode easysrc_add(struct slist_wc **plist, const char *bupf);
+extern CURLcode easysrc_add(struct slist_wc **plist, const char *line);
 extern CURLcode easysrc_addf(struct slist_wc **plist,
                              const char *fmt, ...) CURL_PRINTF(2, 3);
 extern CURLcode easysrc_perform(void);

src/tool_getpass.c

@@ -162,7 +162,7 @@ static bool ttyecho(bool enable, int fd)
 }
 
 char *getpass_r(const char *prompt, /* prompt to display */
-                char *password,     /* buffer to store password in */
+                char *buffer,       /* buffer to store password in */
                 size_t buflen)      /* size of buffer to store password in */
 {
   ssize_t nread;
@@ -174,11 +174,11 @@ char *getpass_r(const char *prompt, /* prompt to display */
   disabled = ttyecho(FALSE, fd); /* disable terminal echo */
 
   fputs(prompt, tool_stderr);
-  nread = read(fd, password, buflen);
+  nread = read(fd, buffer, buflen);
   if(nread > 0)
-    password[--nread] = '\0'; /* null-terminate where enter is stored */
+    buffer[--nread] = '\0'; /* null-terminate where enter is stored */
   else
-    password[0] = '\0'; /* got nothing */
+    buffer[0] = '\0'; /* got nothing */
 
   if(disabled) {
     /* if echo actually was disabled, add a newline */
@@ -189,7 +189,7 @@ char *getpass_r(const char *prompt, /* prompt to display */
   if(STDIN_FILENO != fd)
     curlx_close(fd);
 
-  return password; /* return pointer to buffer */
+  return buffer; /* return pointer to buffer */
 }
 
 #endif /* DONE */

src/tool_paramhlp.h

@@ -44,7 +44,7 @@ ParameterError str2unum(long *val, const char *str);
 ParameterError oct2nummax(long *val, const char *str, long max);
 ParameterError str2unummax(long *val, const char *str, long max);
 ParameterError secs2ms(long *val, const char *str);
-ParameterError proto2num(const char * const *val, char **obuf,
+ParameterError proto2num(const char * const *val, char **ostr,
                          const char *str);
 ParameterError check_protocol(const char *str);
 ParameterError str2offset(curl_off_t *val, const char *str);