staging: rtl8188eu: remove unwanted assignment

remove an unwanted assignment to a variable which is overwritten in the
very next line.The first value assigned is not used.

Signed-off-by: Hari Prasath Gujulan Elango <hgujulan@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>