res_hep: fix major leak that occurs when config is missing or enabled=no.

Add missing unreference in hepv3_send_packet.

ASTERISK-24491 #close
Reported by: Zane Conkle
Tested by: Zane Conkle
Review: https://reviewboard.asterisk.org/r/4150/
........

Merged revisions 427400 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@427405 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_hep.c

@@ -532,6 +532,7 @@ int hepv3_send_packet(struct hepv3_capture_info *capture_info)
 	int res;
 
 	if (!config || !config->general->enabled) {
+		ao2_ref(capture_info, -1);
 		return 0;
 	}