tweaks: rename a function to better match its counterpart

Also rename its parameter, to describe what it ought to be.

src/global.c

@@ -1699,13 +1699,13 @@ sc *strtosc(const char *input)
 	return s;
 }
 
-/* Interpret a menu name and return the corresponding menu flag. */
-int strtomenu(const char *input)
+/* Return the symbol that corresponds to the given menu name. */
+int name_to_menu(const char *name)
 {
 	int index = -1;
 
 	while (++index < NUMBER_OF_MENUS)
-		if (strcasecmp(input, menunames[index]) == 0)
+		if (strcasecmp(name, menunames[index]) == 0)
 			return menusymbols[index];
 
 	return -1;

src/proto.h

@@ -328,9 +328,11 @@ void set_speller_shortcut(void);
 #endif
 const subnfunc *sctofunc(const sc *s);
 const char *flagtostr(int flag);
+#ifdef ENABLE_NANORC
 sc *strtosc(const char *input);
-int strtomenu(const char *input);
+int name_to_menu(const char *name);
 char *menu_to_name(int menu);
+#endif
 #ifdef DEBUG
 void thanks_for_all_the_fish(void);
 #endif

src/rcfile.c

@@ -422,7 +422,7 @@ void parse_binding(char *ptr, bool dobind)
 		}
 	}
 
-	menu = strtomenu(menuptr);
+	menu = name_to_menu(menuptr);
 	if (menu < 1) {
 		rcfile_error(N_("Cannot map name \"%s\" to a menu"), menuptr);
 		goto free_things;