staging: r8188eu: place constants on the right side of tests

Conform to Linux kernel coding style.

Reported by checkpatch:

WARNING: Comparisons should place the constant on the right side of the test

Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Link: https://lore.kernel.org/r/0f3db3586b3668d6d784e075bc52ffd88b0920d2.1648888461.git.remckee0@gmail.com


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