Merge pull request #1099 from mkbel/fix_compiler_warnings

Fix compiler warnings

Firmware/mmu.cpp

@@ -467,13 +467,11 @@ void mmu_M600_wait_and_beep() {
 void mmu_M600_load_filament(bool automatic)
 { 
 	//load filament for mmu v2
-		  bool yes = false;
 		  tmp_extruder = mmu_extruder;
 		  if (!automatic) {
 #ifdef MMU_M600_SWITCH_EXTRUDER
-			  yes = lcd_show_fullscreen_message_yes_no_and_wait_P(_i("Do you want to switch extruder?"), false);
+		      bool yes = lcd_show_fullscreen_message_yes_no_and_wait_P(_i("Do you want to switch extruder?"), false);
 			  if(yes) tmp_extruder = choose_extruder_menu();
-			  else tmp_extruder = mmu_extruder;
 #endif //MMU_M600_SWITCH_EXTRUDER
 		  }
 		  else {

Firmware/ultralcd.cpp

@@ -482,12 +482,10 @@ void lcdui_print_temp(char type, int val_current, int val_target)
 // Print Z-coordinate (8 chars total)
 void lcdui_print_Z_coord(void)
 {
-	int chars = 8;
     if (custom_message_type == CUSTOM_MSG_TYPE_MESHBL)
         lcd_puts_P(_N("Z   --- "));
     else
-		chars = lcd_printf_P(_N("Z%6.2f "), current_position[Z_AXIS]);
-//	lcd_space(8 - chars);
+		lcd_printf_P(_N("Z%6.2f "), current_position[Z_AXIS]);
 }
 
 #ifdef PLANNER_DIAGNOSTICS
@@ -527,8 +525,7 @@ void lcdui_print_percent_done(void)
 	char per[4];
 	bool num = IS_SD_PRINTING || (PRINTER_ACTIVE && (print_percent_done_normal != PRINT_PERCENT_DONE_INIT));
 	sprintf_P(per, num?_N("%3hhd"):_N("---"), calc_percent_done());
-	int chars = lcd_printf_P(_N("%3S%3s%%"), src, per);
-//	lcd_space(7 - chars);
+	lcd_printf_P(_N("%3S%3s%%"), src, per);
 }
 
 // Print extruder status (5 chars total)