staging: rtl8712: remove extra blank lines

Remove extra blank lines to adhere to Linux kernel coding style.
Reported by checkpatch.

Signed-off-by: Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
Link: https://lore.kernel.org/r/d56183614a04590bdf3a6280b7f23664a5bb394c.1617568354.git.zhansayabagdaulet@gmail.com


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