Return group counting to previous behavior where you could only have one group per category. (issue #9711 reported by irroot)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@69127 65c4cc65-6c06-0410-ace0-fbb531ad65f3

app.c

@@ -1047,12 +1047,16 @@ int ast_app_group_set_channel(struct ast_channel *chan, char *data)
 		len += strlen(category) + 1;
 
 	AST_LIST_LOCK(&groups);
-	AST_LIST_TRAVERSE(&groups, gi, list) {
-		if (gi->chan == chan && !strcasecmp(gi->group, group) && (ast_strlen_zero(category) || (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, category))))
+	AST_LIST_TRAVERSE_SAFE_BEGIN(&groups, gi, list) {
+		if ((gi->chan == chan) && ((ast_strlen_zero(category) && ast_strlen_zero(gi->category)) || (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, category)))) {
+			AST_LIST_REMOVE_CURRENT(&groups, list);
+			free(gi);
 			break;
+		}
 	}
+	AST_LIST_TRAVERSE_SAFE_END
 
-	if (!gi && (gi = calloc(1, len))) {
+	if ((gi = calloc(1, len))) {
 		gi->chan = chan;
 		gi->group = (char *) gi + sizeof(*gi);
 		strcpy(gi->group, group);