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swap: make sure swap chan has ORDWR mode on fdtochan()

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

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

@@ -795,7 +795,7 @@

 		if(buf[0]<'0' || '9'<buf[0])

 			error(Ebadarg);

 		fd = strtoul(buf, 0, 0);

-		swc = fdtochan(fd, -1, 1, 1);

+		swc = fdtochan(fd, ORDWR, 1, 1);

 		setswapchan(swc);

 		break;