staging: wilc1000: remove unnecessary 'out of memory' message in handle_key()

Fix "Possible unnecessary 'out of memory' message" issue reported by
checkpatch.pl script.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>