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devgpio: make reading ctl file return 0 bytes

--- a/sys/src/9/bcm/devgpio.c

+++ b/sys/src/9/bcm/devgpio.c

@@ -448,6 +448,7 @@

 		n = 1;

 		break;

 	case Qctl:

+		n = 0;

 		break;

 	case Qevent:

 		if(off >= 4)

@@ -555,10 +556,10 @@

 			break;

 		case CMfunc:

 			pin = getpin(cb->f[2]);

-			arg = cb->f[1];

 			if(pin == -1) {

 				error(Ebadctl);

 			}

+			arg = cb->f[1];

 			for(i = 0; i < nelem(funcname); i++)

 			{

 				if(strncmp(funcname[i], arg, strlen(funcname[i])) == 0)

@@ -588,7 +589,6 @@

 			if(pin == -1) {

 				error(Ebadctl);

 			}

-				

 			arg = cb->f[1];

 			for(i = 0; i < nelem(evtypename); i++)

 			{