fix(resolver): delete the cursor of the OCaml structure walk

ocaml_collect_structure created a tree cursor and had no ts_tree_cursor_delete at all. Its one exit after the cursor is the fall-through at the end of the loop, so every struct of every OCaml file leaked one. LeakSanitizer on Linux reported it at adapter_ocaml.c:603 from resolver_source_langs. The other three cursors in the file are already paired.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

internal/cbm/resolve/adapter_ocaml.c

@@ -664,6 +664,7 @@ static void ocaml_collect_structure(cbm_source_walk_t *walk, const char *owner,
             }
         }
     }
+    ts_tree_cursor_delete(&cursor);
 }
 
 /* Where this file stands among the modules of its build. */