fixed warnings in PID.h

git-svn-id: https://arducopter.googlecode.com/svn/trunk@2560 f9c3cf11-9bcb-44bc-f272-b75c42450872

libraries/PID/PID.h

@@ -107,8 +107,8 @@ public:
 	void operator() (const float p,
 	                 const float i,
 	                 const float d,
-	                 const int16_t imax) {
-		_kp = p; _ki = i; _kd = d; _imax = imax;
+	                 const int16_t imaxval) {
+		_kp = p; _ki = i; _kd = d; _imax = imaxval;
 	}
 
 	float	kP() const				{ return _kp.get(); }