get_proximity() crashes on interfaces with no addresses

[Doug Nazar <nazard@xxxxxxxx>]

Since commit aa6f7793 [autofs-5.0.7 - fix ipv6 proximity calculation] 
uses getifaddrs however it crashes on interfaces with no addresses. Fix 
the NULL check to ignore interfaces with no addresses.

Should it also check for the IFF_UP flag?

Doug

diff -ur autofs-5.0.7.orig/modules/replicated.c autofs-5.0.7/modules/replicated.c
--- autofs-5.0.7.orig/modules/replicated.c	2013-05-10 04:48:32.000000000 -0400
+++ autofs-5.0.7/modules/replicated.c	2013-05-10 04:50:07.000000000 -0400
@@ -166,7 +166,7 @@
 	this = ifa;
 	while (this) {
 		if (this->ifa_flags & IFF_POINTOPOINT ||
-		    this->ifa_addr->sa_data == NULL) {
+		    this->ifa_addr == NULL) {
 			this = this->ifa_next;
 			continue;
 		}
@@ -203,7 +203,7 @@
 	this = ifa;
 	while (this) {
 		if (this->ifa_flags & IFF_POINTOPOINT ||
-		    this->ifa_addr->sa_data == NULL) {
+		    this->ifa_addr == NULL) {
 			this = this->ifa_next;
 			continue;
 		}