Fix syntax errors in #ifdef.

Marlin/Marlin_main.cpp

@@ -1616,7 +1616,7 @@ void process_commands()
 #ifdef SCARA
 	  calculate_delta(current_position);
       plan_set_position(delta[X_AXIS], delta[Y_AXIS], delta[Z_AXIS], current_position[E_AXIS]);
-#endif SCARA
+#endif // SCARA
 
       #ifdef ENDSTOPS_ONLY_FOR_HOMING
         enable_endstops(false);
@@ -3053,11 +3053,12 @@ Sigma_Exit:
 
           if (pin_number > -1)
           {
+            int target = LOW;
+
             st_synchronize();
 
             pinMode(pin_number, INPUT);
 
-            int target;
             switch(pin_state){
             case 1:
               target = HIGH;

Marlin/temperature.cpp

@@ -425,7 +425,7 @@ void manage_heater()
   for(int e = 0; e < EXTRUDERS; e++) 
   {
 
-  #ifdef THERMAL_RUNAWAY_PROTECTION_PERIOD && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
+#if defined (THERMAL_RUNAWAY_PROTECTION_PERIOD) && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
     thermal_runaway_protection(&thermal_runaway_state_machine[e], &thermal_runaway_timer[e], current_temperature[e], target_temperature[e], e, THERMAL_RUNAWAY_PROTECTION_PERIOD, THERMAL_RUNAWAY_PROTECTION_HYSTERESIS);
   #endif
 
@@ -725,7 +725,7 @@ static void updateTemperaturesFromRawValues()
     #ifdef TEMP_SENSOR_1_AS_REDUNDANT
       redundant_temperature = analog2temp(redundant_temperature_raw, 1);
     #endif
-    #ifdef FILAMENT_SENSOR  && (FILWIDTH_PIN > -1)    //check if a sensor is supported 
+    #if defined (FILAMENT_SENSOR) && (FILWIDTH_PIN > -1)    //check if a sensor is supported 
       filament_width_meas = analog2widthFil();
     #endif  
     //Reset the watchdog after we know we have a temperature measurement.
@@ -983,7 +983,7 @@ void setWatch()
 #endif 
 }
 
-#ifdef THERMAL_RUNAWAY_PROTECTION_PERIOD && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
+#if defined (THERMAL_RUNAWAY_PROTECTION_PERIOD) && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
 void thermal_runaway_protection(int *state, unsigned long *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc)
 {
 /*

Marlin/temperature.h

@@ -162,7 +162,7 @@ void disable_heater();
 void setWatch();
 void updatePID();
 
-#ifdef THERMAL_RUNAWAY_PROTECTION_PERIOD && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
+#if defined (THERMAL_RUNAWAY_PROTECTION_PERIOD) && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0
 void thermal_runaway_protection(int *state, unsigned long *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
 static int thermal_runaway_state_machine[3]; // = {0,0,0};
 static unsigned long thermal_runaway_timer[3]; // = {0,0,0};