staging: r8188eu: cmd_issued_cnt is set but not used

cmd_issued_cnt in struct cmd_priv is set but not used. It can
be removed.

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220102175932.89127-5-martin@kaiser.cx


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