staging: wilc1000: removes function 'wilc_dealloc_network_info()'

This patch removes function 'wilc_dealloc_network_info()'.
Does not need this function which only free memory.
Therefore, this function is removed and changed directly with kfree.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>