9p: use struct mutex instead of struct semaphore
Replace semaphores protecting use flags with a mutex. Signed-off-by: NJosef 'Jeff' Sipek <jeffpc@josefsipek.net> Acked-by: NEric Van Hensbergen <ericvh@gmail.com>
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Replace semaphores protecting use flags with a mutex. Signed-off-by: NJosef 'Jeff' Sipek <jeffpc@josefsipek.net> Acked-by: NEric Van Hensbergen <ericvh@gmail.com>