Fix gpio ISR

Gpio utility gets wpi pin numger, not gpio pin number. Calling with latter leads to error.

wiringPi/wiringPi.c

@@ -2030,7 +2030,7 @@ int wiringPiISR (int pin, int mode, void (*function)(void))
     else
       modeS = "both" ;
 
-    sprintf (pinS, "%d", bcmGpioPin) ;
+    sprintf (pinS, "%d", pin) ;
 
     if ((pid = fork ()) < 0)	// Fail
       return wiringPiFailure (WPI_FATAL, "wiringPiISR: fork failed: %s\n", strerror (errno)) ;