since sole argument to set_duplicate_opt_detection was unused, eliminate it altogether

include/extern.h

@@ -1869,7 +1869,7 @@ E char FDECL(map_menu_cmd, (CHAR_P));
 E void FDECL(show_menu_controls, (winid, BOOLEAN_P));
 E void FDECL(assign_warnings, (uchar *));
 E char *FDECL(nh_getenv, (const char *));
-E void FDECL(set_duplicate_opt_detection, (int));
+E void NDECL(reset_duplicate_opt_detection);
 E void FDECL(set_wc_option_mod_status, (unsigned long, int));
 E void FDECL(set_wc2_option_mod_status, (unsigned long, int));
 E void FDECL(set_option_mod_status, (const char *, int));

src/files.c

@@ -3059,7 +3059,7 @@ int src;
         return FALSE;
 
     /* begin detection of duplicate configfile options */
-    set_duplicate_opt_detection(1);
+    reset_duplicate_opt_detection();
     free_config_sections();
     iflags.parse_config_file_src = src;
 
@@ -3068,7 +3068,7 @@ int src;
 
     free_config_sections();
     /* turn off detection of duplicate configfile options */
-    set_duplicate_opt_detection(0);
+    reset_duplicate_opt_detection();
     return rv;
 }
 

src/options.c

@@ -5788,8 +5788,7 @@ boolean val_allowed;
 }
 
 void
-set_duplicate_opt_detection(on_or_off)
+reset_duplicate_opt_detection(VOID_ARGS)
-int on_or_off;
 {
     int k;