fix(qrcode): fix crash due to buf_unalign modification (#4987)

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>

tests/src/test_cases/libs/test_qrcode.c

@@ -0,0 +1,59 @@
+#if LV_BUILD_TEST
+#include "../lvgl.h"
+
+#include "unity/unity.h"
+
+#if LV_USE_QRCODE
+
+static lv_obj_t * active_screen = NULL;
+
+void setUp(void)
+{
+    active_screen = lv_screen_active();
+}
+
+void tearDown(void)
+{
+    lv_obj_clean(active_screen);
+}
+
+void test_barcode_normal(void)
+{
+    lv_color_t bg_color = lv_palette_lighten(LV_PALETTE_LIGHT_BLUE, 5);
+    lv_color_t fg_color = lv_palette_darken(LV_PALETTE_BLUE, 4);
+
+    lv_obj_t * qr = lv_qrcode_create(active_screen);
+    TEST_ASSERT_NOT_NULL(qr);
+    lv_qrcode_set_size(qr, 150);
+    lv_qrcode_set_dark_color(qr, fg_color);
+    lv_qrcode_set_light_color(qr, bg_color);
+
+    /*Set data*/
+    const char * data = "https://lvgl.io";
+    lv_result_t res = lv_qrcode_update(qr, data, strlen(data));
+    TEST_ASSERT_EQUAL(res, LV_RESULT_OK);
+    lv_obj_center(qr);
+
+    /*Add a border with bg_color*/
+    lv_obj_set_style_border_color(qr, bg_color, 0);
+    lv_obj_set_style_border_width(qr, 5, 0);
+    TEST_ASSERT_EQUAL_SCREENSHOT("libs/qrcode_1.png");
+}
+
+#else
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_barcode_normal(void)
+{
+}
+
+#endif
+
+#endif