staging: rtl8723bs: Remove space before tab

Fix warning by removing space before tab.

Signed-off-by: Javier F. Arias <jarias.linux@gmail.com>
Link: https://lore.kernel.org/r/20191008211557.iv3hdpbklgaddlt3@gmail.com


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