engine: fix memory leaks with parse error handling in flb_slist_split_string.

Signed-off-by: Phillip Whelan <[email protected]>

Author: pwhelan

src/flb_slist.c

@@ -274,6 +274,7 @@ int flb_slist_split_string(struct mk_list *list, const char *str,
 
         ret = flb_slist_add_n(list, p_init, val_len);
         if (ret == -1) {
+            flb_slist_destroy(list);
             return -1;
         }
         count++;
@@ -294,6 +295,7 @@ int flb_slist_split_string(struct mk_list *list, const char *str,
 
             ret = flb_slist_add(list, p_end);
             if (ret == -1) {
+                flb_slist_destroy(list);
                 return -1;
             }
             count++;