staging: wilc1000: remove redundant assignment of variable

This patch the removes the redundant assignement of the variable ret as
its being overwritren before being used anywhere.

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