getifaddrs: Prevent possible NULL pointer access

[Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>]

Hello,

the example code for getifaddrs() contains a possible NULL pointer access.
Attached is a patch against man-pages 3.22 from Fedora 12.

Best regards,
Thomas Jarosch

diff -u -r -p man-pages-3.22/man3/getifaddrs.3 man-pages.prevent_NULL/man3/getifaddrs.3
--- man-pages-3.22/man3/getifaddrs.3	2009-07-25 08:53:32.000000000 +0200
+++ man-pages.prevent_NULL/man3/getifaddrs.3	2010-10-05 14:13:25.536917362 +0200
@@ -245,6 +245,9 @@ main(int argc, char *argv[])
        can free list later */
 
     for (ifa = ifaddr; ifa != NULL; ifa = ifa\->ifa_next) {
+        if (ifa\->ifa_addr == NULL)
+            continue;
+
         family = ifa\->ifa_addr\->sa_family;
 
         /* Display interface name and family (including symbolic