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devuart: make sure consuart was enabled before setting serialoq

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

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

@@ -285,7 +285,7 @@

 uartinit(void)

 {

 	/* now that the timers are ticking, enable buffered uart */

-	if(serialoq == nil && consuart != nil)

+	if(serialoq == nil && consuart != nil && consuart->enabled)

 		serialoq = consuart->oq;

 }