Fix a crash due to a potentially NULL p->options.

Thanks to mnicholson for pointing it out.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@200146 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -8971,7 +8971,7 @@ static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, in
 	 * Similarly, if we need to re-send an INVITE with auth credentials, then we
 	 * need to use the same branch as we did the first time we sent the INVITE.
 	 */
-	if (sipmethod == SIP_CANCEL || (sipmethod == SIP_INVITE && !ast_strlen_zero(p->options->auth))) {
+	if (sipmethod == SIP_CANCEL || (sipmethod == SIP_INVITE && p->options && !ast_strlen_zero(p->options->auth))) {
 		p->branch = p->invite_branch;
 		build_via(p);
 	} else if (newbranch) {