Corrected typecast in usb_flightsim.cpp

Signed-off-by: Jorg Neves Bliesener <jbliesener@bliesener.com>

teensy3/usb_flightsim.cpp

 		if (!hasCallbackInfo) {
 			(*change_callback)(val);
 		} else {
-			(*(void(*)(long,void*))change_callback)(val,callbackInfo);
+			(*(void(*)(float,void*))change_callback)(val,callbackInfo);
 		}
 	}
 }