Backport(v1.19): fix(buffer): decrement queue_size in ensure so failed purge does not leak (#5475) - #5487

Backport(v1.19): fix(buffer): decrement queue_size in ensure so failed purge does not leak (#5475)#5487

Watson1978 merged 1 commit into

v1.19fluent/fluentd:v1.19from

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