res_hep: Fix crash when hep.conf not available

Parts of res_hep properly checked for a valid configuration object before
attempting to access the configuration. A check, however, was missed when
a packet is sent. This patch fixes the crash caused by not checking if the
configuration object is valid.
........

Merged revisions 411668 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@411669 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_hep.c

@@ -532,7 +532,7 @@ int hepv3_send_packet(struct hepv3_capture_info *capture_info)
 	RAII_VAR(struct module_config *, config, ao2_global_obj_ref(global_config), ao2_cleanup);
 	int res;
 
-	if (!config->general->enabled) {
+	if (!config || !config->general->enabled) {
 		return 0;
 	}