kconfig: clean up nested if-conditionals in check_conf()

Unify the outer two if-conditionals into one. This decreases the
indent level by one.

Also, change the if-else blocks:

    if (input_mode == listnewconfig) {
            ...
    } else if (input_mode == helpnewconfig) {
            ...
    } else {
            ...
    }

into the switch statement.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/conf.c

@@ -419,10 +419,12 @@ static void check_conf(struct menu *menu)
 		return;
 
 	sym = menu->sym;
-	if (sym && !sym_has_value(sym)) {
-		if (sym_is_changeable(sym) ||
-		    (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)) {
-			if (input_mode == listnewconfig) {
+	if (sym && !sym_has_value(sym) &&
+	    (sym_is_changeable(sym) ||
+	     (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes))) {
+
+		switch (input_mode) {
+		case listnewconfig:
 			if (sym->name) {
 				const char *str;
 
@@ -436,17 +438,18 @@ static void check_conf(struct menu *menu)
 					printf("%s%s=%s\n", CONFIG_, sym->name, str);
 				}
 			}
-			} else if (input_mode == helpnewconfig) {
+			break;
+		case helpnewconfig:
 			printf("-----\n");
 			print_help(menu);
 			printf("-----\n");
-
-			} else {
+			break;
+		default:
 			if (!conf_cnt++)
 				printf("*\n* Restart config...\n*\n");
 			rootEntry = menu_get_parent_menu(menu);
 			conf(rootEntry);
-			}
+			break;
 		}
 	}