Remove the additional pin variable in Servo.cpp

as sugested by @c-born
inhttps://github.com/MarlinFirmware/Marlin/issues/1885#issuecomment-92618240

Marlin/servo.cpp

 
 uint8_t Servo::attach(int pin, int min, int max) {
   if (this->servoIndex < MAX_SERVOS ) {
-  #if defined(ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
-    if (pin > 0) this->pin = pin; else pin = this->pin;
-  #endif
+    if(pin == 0)
+      pin = servos[this->servoIndex].Pin.nbr;
     pinMode(pin, OUTPUT);                                   // set servo pin to output
     servos[this->servoIndex].Pin.nbr = pin;
     // todo min/max check: abs(min - MIN_PULSE_WIDTH) /4 < 128

Marlin/servo.h

     int read();                        // returns current pulse width as an angle between 0 and 180 degrees
     int readMicroseconds();            // returns current pulse width in microseconds for this servo (was read_us() in first release)
     bool attached();                   // return true if this servo is attached, otherwise false
-    #if defined(ENABLE_AUTO_BED_LEVELING) && PROBE_SERVO_DEACTIVATION_DELAY > 0
-      int pin;                           // store the hardware pin of the servo
-    #endif
+
   private:
     uint8_t servoIndex;               // index into the channel data for this servo
     int8_t min;                       // minimum is this value times 4 added to MIN_PULSE_WIDTH