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uarti8250: print on malloc failure

--- a/sys/src/9/pc/uarti8250.c

+++ b/sys/src/9/pc/uarti8250.c

@@ -621,12 +621,14 @@

 {

 	Ctlr *ctlr;

-	if((ctlr = malloc(sizeof(Ctlr))) != nil){

-		ctlr->io = io;

-		ctlr->irq = irq;

-		ctlr->tbdf = tbdf;

+	ctlr = malloc(sizeof(Ctlr));

+	if(ctlr == nil){

+		print("i8250alloc: no memory for Ctlr\n");

+		return nil;

 	}

-

+	ctlr->io = io;

+	ctlr->irq = irq;

+	ctlr->tbdf = tbdf;

 	return ctlr;

 }

-- 

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