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devuart: fix no memory panic with zero number of uarts

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

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

@@ -194,7 +194,7 @@

 	uartndir = 1 + 3*uartnuart;

 	uartdir = xalloc(uartndir * sizeof(Dirtab));

-	if (uart == nil || uartdir == nil)

+	if(uartnuart && uart == nil || uartdir == nil)

 		panic("uartreset: no memory");

 	dp = uartdir;

 	strcpy(dp->name, ".");