Corrected unused var, default switch, Travis tests (#12477)

Marlin/src/HAL/shared/I2cEeprom.cpp

@@ -129,7 +129,6 @@ void eeprom_update_block(const void *pos, void* eeprom_address, size_t n) {
 
 
 uint8_t eeprom_read_byte(uint8_t *pos) {
-  byte data = 0xFF;
   unsigned eeprom_address = (unsigned)pos;
 
   eeprom_init();

Marlin/src/module/tool_change.cpp

@@ -479,6 +479,8 @@ inline void invalid_extruder_error(const uint8_t e) {
         active_extruder_parked = true;
         delayed_move_time = 0;
         break;
+      default:
+        break;
     }
 
     #if ENABLED(DEBUG_LEVELING_FEATURE)

buildroot/share/tests/LPC1768_tests

@@ -55,7 +55,7 @@ opt_enable COREYX USE_XMAX_PLUG DAC_MOTOR_CURRENT_DEFAULT \
            SHOW_TEMP_ADC_VALUES HOME_Y_BEFORE_X EMERGENCY_PARSER FAN_KICKSTART_TIME \
            ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED ADVANCED_OK \
            VOLUMETRIC_DEFAULT_ON NO_WORKSPACE_OFFSETS ACTION_ON_KILL \
-           EXTRA_FAN_SPEED FWERETRACT Z_DUAL_STEPPER_DRIVERS Z_DUAL_ENDSTOPS \
+           EXTRA_FAN_SPEED FWRETRACT Z_DUAL_STEPPER_DRIVERS Z_DUAL_ENDSTOPS \
            MENU_ADDAUTOSTART SDCARD_SORT_ALPHA
 opt_set FAN_MIN_PWM 50
 opt_set FAN_KICKSTART_TIME 100

buildroot/share/tests/megaatmega2560_tests

@@ -157,7 +157,7 @@ opt_enable COREYX USE_XMAX_PLUG \
            SHOW_TEMP_ADC_VALUES HOME_Y_BEFORE_X EMERGENCY_PARSER \
            ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED ADVANCED_OK \
            VOLUMETRIC_DEFAULT_ON NO_WORKSPACE_OFFSETS ACTION_ON_KILL \
-           EXTRA_FAN_SPEED FWERETRACT Z_DUAL_STEPPER_DRIVERS Z_DUAL_ENDSTOPS \
+           EXTRA_FAN_SPEED FWRETRACT Z_DUAL_STEPPER_DRIVERS Z_DUAL_ENDSTOPS \
            MENU_ADDAUTOSTART SDCARD_SORT_ALPHA
 opt_set FAN_MIN_PWM 50
 opt_set FAN_KICKSTART_TIME 100