staging: rtl8723bs: Fix indentation warnings

Fix indentation warnings to improve the code formatting.
Issue found by checkpatch.
Signed-off-by: Javier F. Arias <jarias.linux@gmail.com>
Link: https://lore.kernel.org/r/166ffc747a4212f81d26b03883dbc04d64deed56.1571284318.git.jarias.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>