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kbdfs: simplfy

--- a/sys/src/cmd/aux/kbdfs/kbdfs.c

+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c

@@ -617,15 +617,18 @@

 	qq = &q;

 	ac = aux;

+	a[AREQ].op = CHANRCV;

 	a[AREQ].c = ac[0];	/* chan(Req*) */

 	a[AREQ].v = &r;

+

 	a[ASTR].c = ac[1];	/* chan(char*) */

 	a[ASTR].v = &s;

+

 	a[AEND].op = CHANEND;

 	for(;;){

-		a[AREQ].op = CHANRCV;

-		a[ASTR].op = (q != nil && s == nil) ? CHANRCV : CHANNOP;

+		a[ASTR].op = s ? CHANNOP : CHANRCV;

+

 		switch(alt(a)){

 		case AREQ:

 			if(r->ifcall.type == Tflush){

-- 

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