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venti: warn when opening /dev/swap fails

--- a/sys/src/cmd/venti/srv/venti.c

+++ b/sys/src/cmd/venti/srv/venti.c

@@ -55,6 +55,8 @@

 		Bterm(bp);

 		if (pgsize > 0 && userpgs > 0 && userused > 0)

 			size = (userpgs - userused) * pgsize;

+	} else {

+		fprint(2, "%s: failed to open /dev/swap\n", argv0);

 	}

 	/* cap it to keep the size within 32 bits */

 	if (size >= 3840UL * 1024 * 1024){