Fix for netlink code that causes crashes with e.g. ppp or tun
interfaces.

Basically a back port of c40b05b4c4226b2c4323a9ba5b096377931682ef:

Author: Denis Vlasenko <vda.linux@googlemail.com>
Date:   Tue Dec 9 00:16:11 2008 +0000

  getaddrinfo: runp->ifa_addr indeed can be NULL, don't dereference it

Index: uClibc-0.9.30.1/libc/inet/getaddrinfo.c
===================================================================
--- uClibc-0.9.30.1.orig/libc/inet/getaddrinfo.c	2009-07-29 08:54:52.000000000 +0300
+++ uClibc-0.9.30.1/libc/inet/getaddrinfo.c	2009-07-29 08:55:16.000000000 +0300
@@ -187,6 +187,8 @@
 		}
 
 		for (runp = ifa; runp != NULL; runp = runp->ifa_next) {
+			if (runp->ifa_addr == NULL)
+				continue;
 #if defined __UCLIBC_HAS_IPV4__
 			if (runp->ifa_addr->sa_family == PF_INET)
 				seen |= SEEN_IPV4;