bpf: Do not walk twice the hash map on free

If someone stores both a timer and a workqueue in a hash map, on free, we
would walk it twice.

Add a check in htab_free_malloced_timers_or_wq and free the timers and
workqueues if they are present.

Fixes: 246331e3f1ea ("bpf: allow struct bpf_wq to be embedded in arraymaps and hashmaps")
Signed-off-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Kumar Kartikeya Dwivedi <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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