Index: rtsock.c
===================================================================
RCS file: /home/ncvs/src/sys/net/rtsock.c,v
retrieving revision 1.140
diff -u -p -r1.140 rtsock.c
--- rtsock.c	22 Mar 2007 10:51:03 -0000	1.140
+++ rtsock.c	26 Mar 2007 09:44:53 -0000
@@ -514,7 +514,9 @@ route_output(struct mbuf *m, struct sock
 					senderr(error);
 				RT_LOCK(rt);
 			}
-			if (info.rti_ifa != rt->rt_ifa && rt->rt_ifa != NULL &&
+			if (info.rti_ifa != NULL &&
+			    info.rti_ifa != rt->rt_ifa &&
+			    rt->rt_ifa != NULL &&
 			    rt->rt_ifa->ifa_rtrequest != NULL) {
 				rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
 				    &info);
@@ -528,12 +530,11 @@ route_output(struct mbuf *m, struct sock
 				}
 				rt->rt_flags |= RTF_GATEWAY;
 			}
-			if (info.rti_ifa != rt->rt_ifa) {
+			if (info.rti_ifa != NULL &&
+			    info.rti_ifa != rt->rt_ifa) {
+				IFAREF(info.rti_ifa);
 				rt->rt_ifa = info.rti_ifa;
-				if (info.rti_ifa != NULL) {
-					IFAREF(info.rti_ifa);
-					rt->rt_ifp = info.rti_ifp;
-				}
+				rt->rt_ifp = info.rti_ifp;
 			}
 			/* Allow some flags to be toggled on change. */
 			if (rtm->rtm_fmask & RTF_FMASK)