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devuart: should use rts() control only when hw flow control is enabled (modem flag)

--- a/sys/src/9/port/devuart.c

+++ b/sys/src/9/port/devuart.c

@@ -711,8 +711,9 @@

 			p->ir = p->iw;

 		}

 		if((n = qproduce(p->iq, ir, iw - ir)) < 0){

+			if(p->modem)

+				(*p->phys->rts)(p, 0);

 			p->serr++;

-			(*p->phys->rts)(p, 0);

 		}

 		else if(n == 0)

 			p->berr++;