Fix fastio extra parenthesis

Firmware/fastio.h

@@ -58,7 +58,7 @@
 #define	_GET_OUTPUT(IO)  ((DIO ## IO ## _DDR & MASK(DIO ## IO ## _PIN)) != 0)
 
 /// check if pin is an timer
-#define	_GET_TIMER(IO)  ((DIO ## IO ## _PWM)
+#define	_GET_TIMER(IO)  (DIO ## IO ## _PWM)
 
 //  why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html