staging: wilc1000: allocate less memory

We should be allocating space for hidden_network_info structs.  They are
slightly smaller than hidden_network structs.  This bug doesn't cause a
runtime issue beyond the very small ammount of extra memory used.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>