diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -5528,18 +5528,12 @@
 	sbuf_new(&sb, udev->dv_fields, sizeof(udev->dv_fields), SBUF_FIXEDLEN);
 	if (dev->nameunit != NULL)
 		sbuf_cat(&sb, dev->nameunit);
-	else
-		sbuf_putc(&sb, '\0');
 	sbuf_putc(&sb, '\0');
 	if (dev->desc != NULL)
 		sbuf_cat(&sb, dev->desc);
-	else
-		sbuf_putc(&sb, '\0');
 	sbuf_putc(&sb, '\0');
 	if (dev->driver != NULL)
 		sbuf_cat(&sb, dev->driver->name);
-	else
-		sbuf_putc(&sb, '\0');
 	sbuf_putc(&sb, '\0');
 	bus_child_pnpinfo_sb(dev, &sb);
 	sbuf_putc(&sb, '\0');