staging: rtl8712: Fixed a comparision coding style warning.

WARNING: Comparisons should place the constant on the right side of the test
Fixed this warning by placing the constant on right side.

Signed-off-by: Rakhi Sharma <rakhish1994@gmail.com&gt;->
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>