Index: sys/dev/ofw/ofw_bus_subr.c
===================================================================
--- sys/dev/ofw/ofw_bus_subr.c
+++ sys/dev/ofw/ofw_bus_subr.c
@@ -351,7 +351,7 @@
 	KASSERT(regsz >= ii->opi_addrc,
 	    ("ofw_bus_lookup_imap: register size too small: %d < %d",
 		regsz, ii->opi_addrc));
-	if (node != -1) {
+	if ((int)node > 0) {
 		rv = OF_getencprop(node, "reg", reg, regsz);
 		if (rv < regsz)
 			panic("ofw_bus_lookup_imap: cannot get reg property");