array: fix reverse()

vlib/builtin/array.v

@@ -338,7 +338,7 @@ pub fn (a array) reverse() array {
 		data: vcalloc(a.cap * a.element_size)
 	}
 	for i in 0..a.len {
-		C.memcpy(arr.data + i * arr.element_size, &a.data[a.len - 1 - i], arr.element_size)
+		C.memcpy(arr.data + i * arr.element_size, &a[a.len - 1 - i], arr.element_size)
 	}
 	return arr
 }

vlib/builtin/array_test.v

@@ -259,6 +259,7 @@ fn test_reverse() {
 	a := [1, 2, 3, 4]
 	b := ['test', 'array', 'reverse']
 	c := a.reverse()
+	println(c)
 	d := b.reverse()
 	for i, _ in c {
 		assert c[i] == a[a.len - i - 1]