staging: rtl8723bs: remove unused variable and empty for cycles left unused in os_dep...

staging: rtl8723bs: remove unused variable and empty for cycles left unused in os_dep/ioctl_linux.c

fix following kernel test robot warnings:

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c:2573:33:
warning: variable ‘preorder_ctrl’ set but
	not used [-Wunused-but-set-variable]
       struct recv_reorder_ctrl *preorder_ctrl;
                                 ^~~~~~~~~~~~~
remove also empty for cycle left unused and counter variable.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/fb1e8ea3cfeda1af27ab1a9393140e144b5cb4b5.1617962215.git.fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>