Fix compiler warnings

lib/lv_lib_qrcode/lv_qrcode.c

@@ -156,7 +156,7 @@ lv_res_t lv_qrcode_update2(lv_obj_t* qrcode, const void* data, uint32_t data_len
 
     lv_img_decoder_dsc_t dec_dsc;
     lv_res_t res = lv_img_decoder_open(&dec_dsc, ext->src, LV_COLOR_CYAN);
-    (void)res;
+    (void)res; // unused
 
     for(int y = 0; y < dec_dsc.header.h; y++) {
         for(int x = 0; x < dec_dsc.header.w; x++) {

src/hasp/hasp.cpp

@@ -278,17 +278,17 @@ void haspProgressMsg(const __FlashStringHelper* msg)
 /*Add a custom apply callback*/
 static void custom_font_apply_cb(lv_theme_t* th, lv_obj_t* obj, lv_theme_style_t name)
 {
-    lv_style_list_t* list;
+    /*    lv_style_list_t* list;
 
-    switch(name) {
-        case LV_THEME_BTN:
-            list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
-            // _lv_style_list_add_style(list, &my_style);
-            break;
-        default:
-            // nothing
-            ;
-    }
+        switch(name) {
+            case LV_THEME_BTN:
+                list = lv_obj_get_style_list(obj, LV_BTN_PART_MAIN);
+                // _lv_style_list_add_style(list, &my_style);
+                break;
+            default:
+                // nothing
+                ;
+        } */
 }
 
 /**

src/hasp/hasp_attribute.cpp

@@ -307,7 +307,7 @@ void my_btnmatrix_map_clear(lv_obj_t* obj)
 
 static void my_btnmatrix_map_create(lv_obj_t* obj, const char* payload)
 {
-    const char** map_p = lv_btnmatrix_get_map_array(obj);
+    // const char** map_p = lv_btnmatrix_get_map_array(obj);
 
     // Create new map
     // Reserve memory for JsonDocument

src/hasp_gui.cpp

@@ -190,6 +190,7 @@ void guiSetup(void)
             disp_drv.ver_res = TFT_HEIGHT;
     }
     lv_disp_t* display = lv_disp_drv_register(&disp_drv);
+    (void)display; // unused
 
     /* Initialize Filesystems */
 #if LV_USE_FS_IF != 0