staging: r8188eu: Remove unused semaphore "io_retevt"
Remove semaphore "io_retevt" because it is never used. Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Link: https://lore.kernel.org/r/20211022101028.30367-3-fmdefrancesco@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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