staging: rtl8188eu: don't block until cmdthread runs

rtw_start_drv_threads starts a cmdthread that runs in a loop. It
reads a command from a queue and processes it. There's no need for
any synchronization when this thread is started.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210505202622.11087-3-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>