staging: rtl8723bs: Switch constant place in test

Switch constant place as it should be on the right side of the test.
Issue found by checkpatch.

Signed-off-by: Javier F. Arias <jarias.linux@gmail.com>
Link: https://lore.kernel.org/r/20191007033202.45czxuochtylkddf@gmail.com


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