kconfig: turn conf_choice() into void function

The return value of conf_choice() is not used.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/conf.c

@@ -446,7 +446,7 @@ static int conf_sym(struct menu *menu)
 	}
 }
 
-static int conf_choice(struct menu *menu)
+static void conf_choice(struct menu *menu)
 {
 	struct symbol *sym, *def_sym;
 	struct menu *child;
@@ -459,19 +459,18 @@ static int conf_choice(struct menu *menu)
 		sym_calc_value(sym);
 		switch (sym_get_tristate_value(sym)) {
 		case no:
-			return 1;
 		case mod:
-			return 0;
+			return;
 		case yes:
 			break;
 		}
 	} else {
 		switch (sym_get_tristate_value(sym)) {
 		case no:
-			return 1;
+			return;
 		case mod:
 			printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
-			return 0;
+			return;
 		case yes:
 			break;
 		}
@@ -551,7 +550,7 @@ static int conf_choice(struct menu *menu)
 			continue;
 		}
 		sym_set_tristate_value(child->sym, yes);
-		return 1;
+		return;
 	}
 }