staging: wilc1000: remove redundant initialization of variable

This patch removes the redundant initialization of the variable 'st' as
it is reassigned a new value before its being used anywhere else.

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