staging: rtl8723bs: Add line after variable declarations

Add whiteline after variable declarations to remove the checkpatch.pl
warning:
WARNING: Missing a blank line after declarations

Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
Link: https://lore.kernel.org/r/20200325164451.GA17569@simran-Inspiron-5558


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