Fix 4 compiler warnings of type: sketch/planner.cpp:872:59: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]

Firmware/planner.cpp

@@ -869,22 +869,22 @@ block->steps_y.wide = labs((target[X_AXIS]-position[X_AXIS]) - (target[Y_AXIS]-p
           enable_e0(); 
           g_uc_extruder_last_move[0] = BLOCK_BUFFER_SIZE*2;
           
-          if(g_uc_extruder_last_move[1] == 0) disable_e1(); 
-          if(g_uc_extruder_last_move[2] == 0) disable_e2(); 
+          if(g_uc_extruder_last_move[1] == 0) {disable_e1();}
+          if(g_uc_extruder_last_move[2] == 0) {disable_e2();}
         break;
         case 1:
           enable_e1(); 
           g_uc_extruder_last_move[1] = BLOCK_BUFFER_SIZE*2;
           
-          if(g_uc_extruder_last_move[0] == 0) disable_e0(); 
-          if(g_uc_extruder_last_move[2] == 0) disable_e2(); 
+          if(g_uc_extruder_last_move[0] == 0) {disable_e0();}
+          if(g_uc_extruder_last_move[2] == 0) {disable_e2();}
         break;
         case 2:
           enable_e2(); 
           g_uc_extruder_last_move[2] = BLOCK_BUFFER_SIZE*2;
           
-          if(g_uc_extruder_last_move[0] == 0) disable_e0(); 
-          if(g_uc_extruder_last_move[1] == 0) disable_e1(); 
+          if(g_uc_extruder_last_move[0] == 0) {disable_e0();}
+          if(g_uc_extruder_last_move[1] == 0) {disable_e1();}
         break;        
       }
     }