[Keyboard] Corne - Remove legacy revision support (#12226)

keyboards/crkbd/keymaps/default/keymap.c

@@ -17,6 +17,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include QMK_KEYBOARD_H
+#include <stdio.h>
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   [0] = LAYOUT_split_3x6_3(
@@ -71,7 +72,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 #ifdef OLED_DRIVER_ENABLE
 oled_rotation_t oled_init_user(oled_rotation_t rotation) {
-  if (!is_master) {
+  if (!is_keyboard_master()) {
     return OLED_ROTATION_180;  // flips the display 180 degrees if offhand
   }
   return rotation;
@@ -157,7 +158,7 @@ void oled_render_logo(void) {
 }
 
 void oled_task_user(void) {
-    if (is_master) {
+    if (is_keyboard_master()) {
         oled_render_layer_state();
         oled_render_keylog();
     } else {