freedreno: Fix leak of u_transfer_helper.

Fixes: d1465b3aeee3 ("freedreno: use u_transfer_helper")
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7695>
(cherry picked from commit 9cc8fc7bbc4a4d7fe4d3635be207daf2a6672662)
2 files changed