out-stackdriver: removed unused variables (fluent#5677)

Signed-off-by: to-s <[email protected]>

Author: to-s

plugins/out_stackdriver/stackdriver.c

@@ -1045,9 +1045,7 @@ static void pack_labels(struct flb_stackdriver *ctx,
                         msgpack_object *payload_labels_ptr)
 {
     int i;
-    int ret;
     int labels_size = 0;
-    char *val;
     struct mk_list *head;
     struct flb_kv *list_kv;
     msgpack_object_kv *obj_kv = NULL;
@@ -1586,7 +1584,6 @@ static flb_sds_t stackdriver_format(struct flb_stackdriver *ctx,
     const char *newtag;
     const char *new_log_name;
     msgpack_object *obj;
-    msgpack_object *labels_ptr;
     msgpack_unpacked result;
     msgpack_sbuffer mp_sbuf;
     msgpack_packer mp_pck;

plugins/out_stackdriver/stackdriver_conf.c

@@ -186,7 +186,6 @@ static int parse_key_value_list(struct flb_stackdriver *ctx,
     flb_sds_t val;
     struct mk_list *head;
     struct flb_slist_entry *entry;
-    msgpack_object_kv *kv = NULL;
 
     if (origin) {
         mk_list_foreach(head, origin) {