mm/page_alloc.c: Remove function return value

The return value of this function has no meaning,
so the original int type is replaced with a void type,
which reduces the execution time of one return.

Signed-off-by: lvqian <lvqian@nfschina.com>

mm/page_alloc.c

@@ -828,17 +828,16 @@ static int __init early_debug_pagealloc(char *buf)
 }
 early_param("debug_pagealloc", early_debug_pagealloc);
 
-static int __init debug_guardpage_minorder_setup(char *buf)
+static void __init debug_guardpage_minorder_setup(char *buf)
 {
 	unsigned long res;
 
 	if (kstrtoul(buf, 10, &res) < 0 ||  res > MAX_ORDER / 2) {
 		pr_err("Bad debug_guardpage_minorder value\n");
-		return 0;
+	} else {
+		_debug_guardpage_minorder = res;
+		pr_info("Setting debug_guardpage_minorder to %lu\n", res);
 	}
-	_debug_guardpage_minorder = res;
-	pr_info("Setting debug_guardpage_minorder to %lu\n", res);
-	return 0;
 }
 early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup);