Merged revisions 279280 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r279280 | pabelanger | 2010-07-24 14:18:43 -0400 (Sat, 24 Jul 2010) | 8 lines
  
  Check if ast_sockaddr is NULL then return. 
  
  (closes issue #17677)
  Reported by: outcast
  Patches:
        issue0017677.patch uploaded by pabelanger (license 224)
  Tested by: elguero
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@279285 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/netsock2.h

@@ -82,7 +82,7 @@ int ast_sockaddr_ipv4_mapped(const struct ast_sockaddr *addr, struct ast_sockadd
  */
 static inline int ast_sockaddr_isnull(const struct ast_sockaddr *addr)
 {
-	return addr->len == 0;
+	return !addr || addr->len == 0;
 }
 
 /*!