staging: rtl8712: remove extra blank lines

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

Signed-off-by: Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
Link: https://lore.kernel.org/r/0bf3df788ca46a59ebb990bf2e3effca7080fd1e.1617697237.git.zhansayabagdaulet@gmail.com


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