mwifiex: Replace semaphore async_sem with mutex
The semaphore 'async_sem' is used as a simple mutex, so it should be written as one. Semaphores are going away in the future. Signed-off-by: NBinoy Jayan <binoy.jayan@linaro.org> Reviewed-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
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