bpf: iter_udp: Retry with a larger batch size without going back to the previous bucket

The current logic is to use a default size 16 to batch the whole bucket.
If it is too small, it will retry with a larger batch size.

The current code accidentally does a state->bucket-- before retrying.
This goes back to retry with the previous bucket which has already
been done. This patch fixed it.

It is hard to create a selftest. I added a WARN_ON(state->bucket < 0),
forced a particular port to be hashed to the first bucket,
created >16 sockets, and observed the for-loop went back
to the "-1" bucket.

Cc: Aditi Ghag <[email protected]>
Fixes: c96dac8d369f ("bpf: udp: Implement batching for sockets iterator")
Acked-by: Yonghong Song <[email protected]>
Signed-off-by: Martin KaFai Lau <[email protected]>
Reviewed-by: Aditi Ghag <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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