Fixes two bugs in the WAIT_FENCE polling loop:
1. Break on timeout returned VK_SUCCESS because ret was read too late.
2. UINT64_MAX timeout_ns overflowed end_time, causing immediate exit.
Fix by reading rsp->ret before the timeout check and using
OS_TIMEOUT_INFINITE (like virtio_pipe_wait in freedreno) to avoid
overflow.
This prevents premature BO teardown during host-side fault recovery.
Fixes: f17c5297d7 ("tu: Add virtgpu support")
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41108>
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