Merge pull request #3149 from esenapaj/patch-1

suppress warnings

Marlin/Marlin_main.cpp

    *   F<fan speed>
    */
   inline void gcode_M145() {
-    uint8_t material = code_seen('S') ? code_value_short() : 0;
+    int8_t material = code_seen('S') ? code_value_short() : 0;
     if (material < 0 || material > 1) {
       SERIAL_ERROR_START;
       SERIAL_ERRORLNPGM(MSG_ERR_MATERIAL_INDEX);

Marlin/ultralcd.cpp

       encoderPosition = 0;
       lcdDrawUpdate = 1;
     }
-    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, "");
+    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, (char*)"");
     if (LCD_CLICKED) lcd_goto_previous_menu();
   }
   static void lcd_babystep_x() { _lcd_babystep(X_AXIS, PSTR(MSG_BABYSTEPPING_X)); }
    * MBL Move to mesh starting point
    */
   static void _lcd_level_bed_homing() {
-    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ"), "Homing");
+    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ"), (char*)"Homing");
     if (axis_known_position[X_AXIS] && axis_known_position[Y_AXIS] && axis_known_position[Z_AXIS]) {
       current_position[Z_AXIS] = MESH_HOME_SEARCH_Z;
       plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);