Fix silly little seg

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3422 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 523ff8e..3d5b823 100755 (executable)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -2421,7 +2421,7 @@ static int sip_register(char *value, int lineno)
                reg->expire = -1;
                reg->timeout =  -1;
                reg->refresh = default_expiry;
-               reg->portno = htons(atoi(porta));
+               reg->portno = porta ? htons(atoi(porta)) : 0;
                reg->callid_valid = 0;
                reg->ocseq = 101;
                ast_mutex_lock(&regl.lock);