staging: r8723au: move constant to right of comparison test

Move constant to right of comparison test to improve readability.

Addresses checkpatch.pl:
	WARNING: Comparisons should place the constant on the
	right side of the test

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>