Eliminate duplicates from container.

(closes issue #18091)
 Reported by: bunny
 Patches: 
       20101006__issue18091.diff.txt uploaded by tilghman (license 14)
 Tested by: bunny


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@298477 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_dialgroup.c

@@ -236,6 +236,11 @@ static int dialgroup_write(struct ast_channel *chan, const char *cmd, char *data
 
 	if (strcasecmp(args.op, "add") == 0) {
 		for (j = 0; j < inter.argc; j++) {
+			/* Eliminate duplicates */
+			if ((entry = ao2_find(grhead->entries, inter.faces[j], 0))) {
+				ao2_ref(entry, -1);
+				continue;
+			}
 			if ((entry = ao2_alloc(sizeof(*entry), NULL))) {
 				ast_copy_string(entry->name, inter.faces[j], sizeof(entry->name));
 				ao2_link(grhead->entries, entry);