staging: wilc1000: fix spelling mistake "dissconect" -> "disconnect"

There is a spelling mistake in a netdev_err error message, fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>