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devuart: make sure uart is enabled in uartkick()

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

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

@@ -644,7 +644,7 @@

 {

 	Uart *p = v;

-	if(p->blocked)

+	if(!p->enabled || p->blocked)

 		return;

 	ilock(&p->tlock);