staging: r8188eu: place constants in right side in a comparison

reported by checkpatch:

Comparisons should place the constant on the right side of the test.

Fix these warnings.

Signed-off-by: Mahak Gupta <mahak_g@cs.iitr.ac.in>
Link: https://lore.kernel.org/r/20220414230757.19348-1-mahak_g@cs.iitr.ac.in


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