staging: rtl8723bs: core: add blank line after variable declaration

This patch fixes the following checkpatch.pl warning:

WARNING: Missing a blank line after declarations

Signed-off-by: Philippe Dixon <philippesdixon@gmail.com>
Link: https://lore.kernel.org/r/c5eedc7a5298b05beb576b7b9e108794ca7bb58c.1623339773.git.philippesdixon@gmail.com


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